ŠĻą”±į>ž’ ƒž’’’{|}~€’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’ģ„ĮM šæ‡Kbjbjā=ā= "0€W€WĀ3’’’’’’lņņņņņņņŠ2Š2Š28Ā2\3ükž2&:&:<:<:<:;;;²œ“œ“œ“œ“œ“œ“œ$Ÿ ½”rŲœMņ;;;;;Ųœ‰zņņ<:<:Ū%ž‰z‰z‰z;Ö<ņ<:ņ<:²œ‰z;²œ‰z€‰z ƒŠ…ņņօ<:: Ą€ōć%Å„.Š2ķw&¢…օÜ;ž0kžŖ…,/¢zv/¢օ‰zņņņņŁMedical Neuroscience 2005 Chapter 1-6 1. Components of cerebral white matter Centrum semiovale Input and output of cortical gray matter Projection fibers Association fibers Internal capsule Anterior limb Genu Posterior limb Corona radiata Continuation of fibers in internal capsule Corpus callosum Splenium Body Genu Rostrum Anterior commissure Interconnects olfactory cortices and temporal lobes Posterior commissure Interconnect two halves of rostal brainstem Eye movement control and papillary responses Chapter 1-7 1. Subcortical gray matter within cerebral hemispheres Basal ganglia = modulate frontal cortex Caudate nucleus Lenticular nucleus = putamen + globus pallidus Hippocampal formation Within parahippocampal gyrus = afferent/efferent connections with cerebral cortex Form fimbria to to medial septal nuclei (precommissural) & mammillary bodies (postcommissural) Amygdala Motivation and emotions Basal forebrain Medial septal nuclei = memory Fornix to hippocampus Lateral septal nuclei = limbic (motivation and emotion) Nucleus basalis of Meynert Project into cerebral cortex Memory and its importance Chapter 1-8 Diencephalon Hypothalamus “Head ganglion” of autonomic nervous system Homeostasis Limbic system Formed by 3 structures = rostral to caudal 1. Optic chiasm Optic nerve cross midline to thalamus 2. Infundibulum Pathway for hypothalamus to regulate pituitary 3. Mammillary bodies Input from hippocampus via postcommissural fornix Mammillothalamic tract From mammillary bodies to anterior nucleus of thalamus Subthalamus Ventral to thalamus Posterior & lateral to hypothalamus White matter pathway Arousal & attention to oculomotor control Subthalamic nucleus = lens-shaped Linked with globus pallidus Hemiballismus = lesion of subthalamic nucleus Thalamus Relay between brainstem and cerebral cortex & between parts of cortex Composed of 3 nuclei = afferent sensory input to cerebral cortex 1. Medial geniculate nucleus From brainstem (ascending auditory) to Heschl’s gyrus (primary auditory) 2. Lateral geniculate nucleus From retina (visual of optic tract) to calcarine fissure via optic radiations 3. Ventral posterior nucleus From brainstem (ascending somatosensory) to postcentral gyrus External medullary lamina Thalamic reticular nucleus = project within thalamus Enable or block thalamus transmission “Switch” on thalamic relay Epithalamus Posterior to thalamus Pineal gland Circadian rhythms Release melatonin hormone Posterior commissure Boundary between midbrain & thalamus Eye movement control & papillary light responses Chapter 1-9 1. Brain stem Brainstem Midbrain Cerebral aqueduct Superior colliculi = optic tectum Attention and movement of eyes & head Inferior colliculi Obligatory relay in ascending auditory pathway Cerebral peduncles Continuation of internal capsule Red nuclei & substantia nigra = motor system Periaqueductal gray Pain sensation to limbic system Midbrain reticular formation Arousal & alertness Superior cerebellar peduncles Outflow tract Cerebellum to cerebrum Form dorsolateral wall of fourth ventricle Pons Middle cererbellar peduncles Inflow tract Cerebrum to cerebellum Medulla Pyramids Continuation of cerebral peduncles, internal capsule, & descending motor of basis pontis Inferior olives Adjunct to cerebellum Medial lemniscus Ascending sensory to thalamus Inferior cerebellar peduncles Inflow pathway From spinal cord and inferior olives to cerebellum Gracile tubercle Gracile nucleus Cuneate tubercle Cuneate nucleus Trigeminal eminence Spinal nucleus of trigeminal nerve Hypoglossal trigone CN XII Vagal trigone CN X Facial colliculus Facial nucleus Chapter 1-10 1. Divisions of cerebellum Vermis Coordination of body midline Cerebellar hemispheres Coordination of lateral body parts Nodule Anterior folium at inferior end of vermis Flocculi Coordination of eye movements Deep cerebellar nuclei Fastigial Globus Emboliform Dentate Chapter 2-1 1. Major cervical arteries of brain Blood supply Right & left internal carotid arteries Right & left vertebral arteries Internal carotid arteries Cerebrum and eyes External carotid arteries Meninges, skull, and extracranial facial soft tissues Vertebral arties Cervical spinal cord, medulla, parts of cerebellum, posterior fossa meninges Basilar artery Supply brainstem, cerebellum, and posterior cerebrum Formed by the 2 vertebral arteries Chapter 2-3 1. Arteries at base of brain Internal carotid artery Petrous bone – middle cranial fossa – lateral to sella turcica – cavernous sinus Superaclinoid segment Carotid siphon = S-shaped at cavernous sinus to superior Carotid T-junction = form anterior and middle cerebral arteries Vertebral artery Foramen magnum Form basilar artery = pons and medullary junction Form two posterior cerebral arteries Posterior communicating artery Middle to posterior cerebral artery Anterior communicating artery Anterior to anterior cerebral artery Circle of Willis Supply collateral blood supply Circle sella turcica, pituitary stalk, and optic chiasm Chapter 2-4 1. Courses of anterior, middle, and posterior cerebral arteries Ophthalmic artery Supply eyeball From anterior proximal supraclinoid carotid artery Above anterior clinoid of sella turcica Posterior communicating artery Posterior of supraclinoid carotid artery Anterior cerebral artery Over rostrum, genu, and body of corpus callosum Supply entire medial surface of hemispheres to splenium of corpus callosum Middle cerebral arteries Laterally from carotid T-junction to sylvian fissure * ALWAYS supply perisylvian cortex (language processing center) Branches from insula to frontal, temporal, and parietal operculae Over frontal, temporal, and parietal lobe Supply most of lateral hemispheres Basilar artery Posterior cerebral arteries Wrap midbrain Branches to inferior temporal lobes to occipital lobes Supply posterior hemisphere and calcarine cortex Brainstem Basilar artery Ventral pons = pontine arteries Paramedian pons = short circumferential arteries Lateral brainstem & cerebellum = long circumferential arteries AICA + SCA Posterior cerebral arteries Midbrain, thalamus, internal capsule Medulla Anterior spinal artery = from two vertebral arteries Midline for entire spinal cord length Supply paramedian medulla Posterior inferior cerebellar arteries Dorsolateral quadrants of medulla Inferior cerebellum Vascular Supply of Brainstem Arterial Territory MidbrainPonsMedullaMedian Midline branches (basilar artery) Midline branches (basilar artery)Midline branches (anterior spinal artery)Paramedian Short circumferential branches (basilar artery) Short circumferential branches (basilar artery) Short circumferential branches (anterior spinal artery) Dorsolateral/cerebellum Posterior cerebral artery/ Superior cerebellar artery (basilar artery) Anterior inferior cerebellar artery (basilar artery)Posterior inferior cerebellar artery (vertebral artery) Chapter 2-4 1. Blood supply of basal ganglia, thalamus, deep cerebral white matter, and brainstem Deep gray matter Branches of anterior, middle, and posterior cerebral arteries Supraclinoid internal carotid artery Basal ganglia Lenticulostriate arteries Branches from anterior and middle cerebral arteries Thalamus Thalamoperforators Branches of basilar artery, proximal posterior cerebral, and posterior communicating arteries Deep cerebral white matter Lenticulostriate Thalamoperforators Small cortical branches of anterior, middle, and posterior cerebral arteries Brainstem Medial Small branches of basilar and anterior spinal arteries Ventrolateral Short circumferential branches from basilar and vertebral arteries Dorsolateral Long circumferential branches from basilar and vertebral arteries Chapter 2-5 1. Major loci of thrombus formation Heart – aorta – proximal internal carotid arteries – distal-most vertebral arteries – proximal basilar artery Microvessels of cerebrum and brainstem 2. Emboli dynamics Bifurcation points Largest artery with the least angle from parent artery Carotid T-junction = usually into middle cerebral artery, rarely anterior cerebral artery 3. Pathogenesis of microvascular strokes Transient ischemic attacks Highly stereotyped Due to atheromatous disease in a small penetrating vessel 4. Probabilistic principles of emboli Cardiogenic embolism is a concern in every stroke patient Cardiogenic embolism is unlikely in a patient with repeated events in a single vascular territory Artery-to-artery thromboembolism is unlikely in patients with strokes in multiple vascular territories Multiple stereotyped events Large vessel embolism = unlikely Microvascular thrombosis, migraine, and seizures = likely 5. Lenticulostriate end zone Proximal cerebral artery occlusion Alternative route Anterior and posterior cerebral arteries – distal middle cerebral branches – trunk of middle cerebral artery – lenticulostriate arteries Lenticulostriate end zone = deep hemispheric white matter lateral superior to body of lateral ventricle Infarction = hemiparesis & sensory loss Motor and sensory in corona radiata 6. Silent infarction of right hemisphere and lacunar Non-silent territory = somatosensory, visual, motor, and language systems “Silent” cortical infarctions More likely in nondominant hemisphere Lacunar infarcts = small, penetrating vessels Small lesions inapparent Putamen Chapter 2-6 1. Vascular anatomy of spinal cord Branches of vertebral arteries Anterior spinal artery Supply ventromedial spinal cord along entire length Dorsal and ventral horns Lateral corticospinal tracts Lateral to spinal cord gray matter Posterior spinal arteries Supply margins of entire cord Supplied from radicular branches of lateral spinal arteries Neck = vertebral arteries Below neck = intercostals arteries Artery of Adamkiewicz = T9-L4 2. Occlusion of artery of Adamkiewicz Thoracic region of cord = least number of spinal arteries “Terminal drought” region Most likely to be affected Artery of Adamkiewicz Infraction of anterior and posterior spinal artery perforators region Lateral corticospinal tracts Lateral spinothalamic tracts Below lesion level “Anterior spinal artery syndrome” Chapter 2-7 1. Elevated central venous pressure and high CSF pressure Superior sagittal sinus – confluens of sinuses – transverse sinuses – sigmoid sinuses – internal jugular veins Inferior sagittal sinus – straight sinus – confluens of sinuses – transverse – sigmoid – internal jugular veins Brain surface go to cortical veins Deep brain go to straight sinus Cavernous sinuses – superior and inferior petrosal sinuses – transverse and sigmoid sinuses Periorbital and paranasal face Drain into cavernous sinuses Central venous pressure Communicate through arachnoid granulations to CSF compartment Obstruction of cerebral venous flow = increased CSF pressure 2. Cerebral sinus thrombosis and elevated intracranial pressure with pseudotumor cerebri Pseudotumor cerebri = increased intracranial pressure in absence of a mass Caused by obstruction of outflow of CSF Sinus thrombosis obstruct CSF though arachnoid granulations Increase in intracranial pressure Intracranial pressure interfere with flow of cytoplasmic constituents along retinal ganglion axons Swelling of optic nerve heads 3. Sinus thrombosis can cause cerebral infarction Sinus thrombosis spread to cortical venous thrombosis Collaterals cannot drain blood from sinuses Perfusion stop = tissue infracted Superior sagittal sinus = most common Parasagittal region of brain = motor cortex of precentral gyrus 4. Cranial venous flow and central facial infections Venous drainage from ocular and paranasal tissues Into cavernous sinuses Chapter 2-8 1. List major principles governing cerebral energy metabolism. Brain = glucose CNS glucose uptake = ATP-linked transport Do not require insulin Exclusively aerobic metabolism No oxygen storage Minimal glucose storage in glia <50% energy for intermediate metabolism >50% energy for maintenance of ion gradients Synthesis, transport, packaging, release, reuptake Require high blood flow = 20% resting cardiac output 2. Cerebral Blood Flow: cerebral vascular autoregulation & arterial CO2 Increase Local Blood Flow Potassium = outflow of potassium from neural cytosol into extracellular space Instantaneous Tigger vasodilatation CO2 concentration Slower Large fluctuation in arterial CO2 O2 concentration Slowest 3. Ranges of cerebral blood flow rates Normal cerebral blood flow = 50-60 mL/100g/min Higher in women Lowest normal cerebral blood flow = 23 mL/100g/min Metabolic reserve of two-thirds Lowest cerebral blood flow without damage = 18-23 mL/100g/min Neural activity ceases Cerebral blood flow infraction = Below 18 mL/100g/min *High cerebral tolerance = makes cardiac surgery feasible & opportunity for treatment of stroke 4. Reduction of blood pressure in patients with acute stroke is catastrophic Ischemic penumbra = volume of tissue in which blood flow is 15-23 mL/100g/min All neurons in region = silent & serious jeopardy Resistance vessels (arterioles) are maximally dilated Cerebral blood flow = linear function of perfusion pressure Reduction in systemic blood pressure = increase infarction size Chapter 3-1 1. Morphology of neurons Dendritic spines = small bulbous excrescences of dendritic neural membrane Increase surface area for axonal contact Abnormal spines = Down’s syndrome Cell body = receiver & metabolic center Axon = conductor & metabolic center Axon hillock = generate action potential Axon terminal = secretory & transmitter Terminate in synaptic boutons = neurotransmitter & neurosecretion * pyramidal neuron = cerebral cortex 2. Neuronal metabolic demand Require glucose and O2 Numerous organelles = high biosynthetic activity Maintenance of processes and neurotransmitter synthesis Prominent ribosomes and rER (Nissl bodies) 3. Elements of cytoskeleton Microtubules 13 thick linear protofilaments = form 25-nm diameter cylinder Neurofilaments (intermediate filament) 24 thin protein filaments of cytokeratin = form 10-nm diameter solid fibril Microfilaments 7-nm diameter fibers composed of two actin filaments Cytoskeleton function: maintenance of neural morphology positioning of membrane proteins (receptors and ion channels) distribution of membrane-bound organelles provide scaffold for axoplasmic transport neurotransmitter release 4. Axoplasmic transport and disorders Axoplasmic transport = process of moving proteins and organelles along axons Require local supply of ATP Anterograde Fast Membrane-bound intracellular organelles (mitochondria, lysosomes) Kinesin motor protein Slow Cytoskeletal proteins Regrowth of axons occur at this slow rate (1 mm per day) Retrograde Trophic support substances (growth factors) Axon terminal to cell body Cell maintenance (proteins & lipids) Path for pathology (rabies, herpes, polio, tetanus) Axotomy = axon being severed from cell body Loss of retrograde axoplasmic transport of trophic factors Wallerian degeneration Vincristine neurotoxicity in Hodgkin’s disease Prevent microtubule polymerization = paresthesias of senses and distal weakness 5. Chemical synapse Presynaptic & postsynaptic regions of thickening synaptic membrane Chapter 3-2 1. Glia Astrocytes Structural matrix Astrocyte foot processes form part of blood-brain-barrier (BBB) Vascular basement membrane & vascular endothelial cells with tight junctions Form glia limitans Maintain neuronal environment Regulate extracellular potassium concentration Reuptake of peptide neurotransmitters & glutamate Produce growth factors Insulate and prevent cross talk of neuron Oligodendrocytes Form & maintain myelin in CNS Contribute myelination of 100 or more internodes Schwann cells Myelination of PNS Similar capacity to astrocytes Secrete extracellular matrix in dorsal root ganglia and peripheral nerves Become phagocytes under injury or inflammation Secrete neurotrophic factors Ependymal cells Line ventricles and central canal Cilia circulate CSF Form choroids plexus of ventricles = make CSF Microglia Multiply at injury site Differentiate into brain macrophages Clear debris & mediate immunologic responses Antigen presentation Targeted by HIV Chapter 3-3 1. Major loci of stem cells in adult CNS Subependymal zone of ventricular system Telencephalon to central canal Dentate gyrus of hippocampal formation Neural parenchyma 2. Normal brain functions that rely on continuous supply of new neurons Olfactory bulb Routine turnover of granule cells by precursor cells in subependymal zone Hippocampal formation Neural precursors in dentate gyrus Ongoing process of new fact memories 3. Brain degeneration effects on neural precursor cells Generation of time- and location-specific signal molecules Regulate proliferation, migration, and differentiation of neural precursors Extension of axons and dendrites to appropriate locations Chapter 3-4 1. Major components of blood-brain barrier Vascular basement membrane Astrocytic foot processes coat of blood vessels & pial surface Vascular endothelial cells Tight junctions Perivascular macrophages (from pericyte = mesenchymal cell) *complete absence of fluid-phase endocytosis & restricted receptor-mediated endocytosis 2. Function of BBB Isolate CNS from molecular and cellular constituents of blood Ionic homeostasis in CNS Exclude microorganisms & leukocytes Selective permeability of metabolites and nutrients CSF composition = low white blood cell (<5/cu mm), no red blood cells, low protein (<45 mg/dL) 3. BBB windows Circumventricular organs High vascularity and gaps between endothelial cells Hypothalamus & pituitary gland Limited receptor-mediated endocytosis (Ion channels) Insulin & leptin Lipid-soluble substances Corticosteroids, estrogen, & testosterone Active & facilitative transport Amino acids & glucose 4. Breakdown of BBB Viral, bacterial, or fungal infection of meninges Facilitate lipid-insoluble antibiotics passage into CNS Meningeal carcinomatosis Damage glucose transporter by cancer Increased gap junctions = MRI * Mannitol disrupt barrier to allow drug enter brain tissue Chapter 3-5 1. Cytoarchitectonic organization of cerebral cortex Comprised of six layers of neurons Regional variation in cortical layers Layer III Outer pyramidal cells Long axons (projection) Project to ipsilateral cortex or across opposite hemisphere Transverse anterior commissure & corpus callosum Layer IV Inner granular cells Receives information from thalamus (target of afferent thalamocortical fibers) Layer V Inner pyramidal cells Long axon (projection) Project outside cerebral cortex (include basal ganglia, thalamus, brainstem, & spinal cord) 2. Projection neuron & interneuron Projection neurons Extensive dendritic arborization Large cell bodies Long axons Important for information processing between structures Interneurons Small dendritic arborizations Small cell bodies Short axons Project short distances (between cortical layers & spinal cord layers) Local information processing 3. Cytoarchitectonic structure of hippocampus 3 layer cortex Connect with parahippocampal gyrus & other structures (amygdala, septal nuclei, thalamus) Consist of dentate gyrus & pyramidal neurons (CA region) 4. Cytoarchitectonic structure of cerebellum 3 layer cortex Molecular layer – Purkinje cell layer – Granule cell layer 5. Hippocampus & cerebellum functions Hippocampus Encode memories via connection of pyramidal neurons to thalamus/basal forebrain to cortex Susceptible to ischemia = amnesia Parahippocampal cortex to dentate cells to pyramidal cells (of hippocampus proper) to cerebral cortex Cerebellum Define space-time envelope of muscle contractions Cerebral cortex & spinal cord to granule cell to molecular layer (parallel fibers) to purkinje cells Chapter 3-6 1. Cytoarchitectonic structure of spinal cord & dorsal root ganglia Dorsal horns = sensory neurons Intermediate zone = preganglionic autonomic neurons (terminate in autonomic ganglia) Ventral horns = motor neurons (terminate in muscles) Dorsal root ganglion Axons bifurcate 1) Dorsal root – spinal nerve – peripheral nerve – sensory receptor 2) Neuron in dorsal horn or up spinal cord to synapse Chapter 3-7 1. Peripheral nerve structure Contain both afferent & efferent fibers = myelinated and unmyelinated Endoneurium = fibroblasts and collagen Perineurium = connective tissue Epineurium = adipocytes, nerve bundles, and blood vessels Regenerate due to epineurium (effective barrier) Chapter 4-1 1. Neurotransmitter processing Synthesis Biogenic amine synthesis Enzymes concentrated at axon terminal Neuropeptide synthesis Enzymes concentrated in rER at cell body Neuropeptide transported to axon terminal Storage Stored in 50-100 nm synaptic vesicles Concentrated at axon terminal Release Voltage-sensitive channels Influx of calcium from depolarization Synaptic vesicles fuse with plasma membrane Reception Neurotransmitter (ligand) bind to receptor Excitatory (glutamate) or inhibitory (GABA) G-proteins or voltage-sensitive ligand-gated ion channels Inactivation Enzymatic catabolism (acetylcholinesterase) Reuptake and catabolism (dopamine) Diffusion out of synaptic cleft and reuptake (glutamate) Chapter 4-2 1. Synthesis and catabolism of glutamate Glutamate = major excitatory neurotransmitter Synthesized from a-ketoglutarate (TCA cycle) Catabolized by reverse route or decarboxylated into GABA Action terminated by carrier-mediated reuptake system & diffusion 2. Major locations of glutamatergic neurons Intrahemispheric connections Interhemispheric connections Corticobulbar (cortex to brainstem) Corticospinal (cortex to spinal cord) 3. Two major functions of glutamate and its receptors Bind to ligand-gated sodium channels (AMPA & kainite receptors) Open transmembrane protein channel Sodium enter Postsynaptic membrane depolarize 4. Seizures, migraine, and stroke Glutamate = excitatory neurotransmitter Paroxysmal discharge = seizure Spreading depression of Leao = 3 mm/min Depression of cortical neuronal activity Chapter 4-3 1. Synthesis and catabolism of GABA GABA = principal inhibitory neurotransmitter of interneurons Synthesized from glutamate via glutamic acid decarboxylase (GAD) Catabolized by GABA-transaminase Yield glutamate & succinate semialdehyde Converted to succinate = TCA cycle Action terminated by carrier-mediated presynaptic reuptake system & diffusion 2. GABA function and receptor Mediate neural signaling = hyperpolarize postsynaptic neuron = inhibition GABAA & GABAC receptor = poteniate Cl- conductance GABAB receptor = potentiate K+ conductance 3. GABAergic neurons location Striatum Globus pallidus Purkinje cells (cerebellum) 4. GABA-mimetic drugs as anticonvulsants Moderation of gluatamatergic effects on sodium & chloride channels 5. Alcohol withdrawal syndrome Alcohol = chronic potentiation of GABAergic neurotransmission Downregulation of GABA receptors Withdraw = deficient of GABA-mediated inhibition Seizures, agitation, tremulousness Lorazepam = potentiates GABAA receptors Increase Cl- channel opening = inhibition Chapter 4-4 1. Glycinergic neuronal location and function Glycine = second most widespread inhibitory neurotransmitter Interneurons Brain Brainstem Spinal cord Open chloride channels 2. Interference of glycinergic neural transmission Limit inhibition of neurons Uninhibited firing of motor neurons Risus sardonicus Increase muscle tone Chapter 4-5 1. Peptide neurotransmitter synthesis, transportation, and degradation Neuropeptides = within-system modulatory neurotransmitters Produced by proteolytic cleavage of large precursor proteins Proteins synthesized by rER in cell body Transported to presynaptic terminal Degraded by extracellular proteases 2. Receptor downregulation (tolerance and dependence) Chronic intensive stimulation Reduction in receptor density (at postsynaptic sites) Reduce sensitivity of target neuron 3. Ligand non-specificity Opioid drugs bind endorphin and enkephalin receptors throughout nervous system Produce side effects from nonspecificity Chapter 4-6 1. Synthesis and degradation of catecholamines Rate-limiting step = tyrosine hydroxylase Become dopaminergic, noradrenergic, or adrenergic Depends on presence of enzymes Degraded by monoamine oxidase (MAO) & catechol-O-methyltransferase (COMT) Eliminated in urine Action terminated by transporter system reuptake Chapter 4-7 1. Synthesis and degradation of serotonin Rate-limiting step = tryptophan hydroxylase Tryptophan – 5-hydroxytryptophan – serotonin Degraded by MAO only Eliminated in urine Chapter 4-8 1. Major dopamine systems Tuberoinfundibular system Originate in hypothalamus Inhibits pituitary secretion of prolactin Nigrostriatal/mesolimbic systems Substantia nigra and ventral tegmental area 2. Specific dopamine receptor blocker Haloperidol = nonspecific D2 blocker Block mesolimbic system Side affects = block dorsal striatum 3. Modulatory biogenic amine neurotransmitters Wide host of functionally disparate targets Each amine neuron has over a million synapses Less variability in firing rates Regulate signal-to-noise ratio 4. Parkinson’s disease, dyskinesias, and psychosis Parkinson’s disease Progressive loss of dopaminergic neurons Located in substantia nigra Reduced dopamine levels in putamen L-Dopa cross BBB Dyskinesias Involuntary muscular movements Over-stimulation of dopamine Psychosis Over-stimulation of dopamine Dopamine receptor antagonist 5. Depression Limbic system Has heavy serotonergic and noradrenergic projections Low serotonin levels Prozac = inhibit serotonin reuptake 6. Migraine CN V activation and gasserian ganglion Vasodilatation of microvasculature Sumatriptan Inhibit release of vasoactive proteins Chapter 4-9 1. Synthesis and degradation of acetylcholine Synthesized by hydrolysis of phosphatidylcholine of cell membranes Degraded by acetylcholinesterase in synaptic cleft Reuptake by high-affinity system 2. Cholinergic neurons within CNS Midbrain reticular formation Basal ganglia Basal forebrain 3. Disorders of neuromuscular junction Myasthenia gravis Acetylcholine receptors destroyed by autoimmune mechanism Decreased sensitivity to acetylcholine Weakness of limbs and mucles Eaton-Lambert syndrome Botulism Toxin disrupt acetylcholine vesicles from fusing with presynaptic membrane Ocular and systemic muscular weakness 4. Memory formation and Alzheimer’s disease Anticholinergic drugs Inhibit acetylcholine in neural connectivity in cerebral cortex Limit memory formation Cholinomimetic drugs Inhibit acetylcholinesterase Increase half-life of acetylcholine Limit decline in neurodegenerative process HormoneArea of Release PathologyDopamine Substantia nigra & Ventral tegmental areaProlactinoma (Tubero-infundibular) Parkinsons (Substantia Nigra) Schizophrenia (mesolimbic) Norepinephrine Locus coeruleusHistamine Tuberomammilliary nucleus of hypothalamusSerotonin Raphe nucleusCholinergicReticular formation Basal ganglia Basal forebrain Motor-neuron ANS Myesthenia Gravis Botulism Alzheimer’s DiseaseGlutamatergicCortical Corticospinal Corticobulbar projections Excitotoxicity Spreading depression Seizures Migraine Stroke Trauma GABAergicInterneuron Basal ganglia Cerebellum (Purkinje cells) Seizures Alcoholism Anxiety disordersGlycinergicInterneurons Brainstem Spinal cord Tetanus (lockjaw) NeurotransmitterPostsynaptic EffectPrecursorsRate-limiting Step in SynthesisRemoval mechanismReceptor TypeAchExcitatoryCholine + acetyl CoACATAchEaseD: nAchR InD: mAchR* GlutamateExcitatoryGlutamineGlutaminaseTransportersD: NMDA, AMPA, Kainate GluR InD: mGluR GABAInhibitoryGlutamateGADTransportersD: GABA-A InD: GABA-B, GABA-C GlycineInhibitory SerinePhosphoserineTransportersD: GlyR Catecholamines (epinephrine, norepinephrine, dopamine) ExcitatoryTyrosineTyrosine hydroxylaseTransporters, MAO, COMT All are indirect, but have different receptors.Serotonin (5-HT)ExcitatoryTryptophanTryptophan hydroxylaseTransporters, MAO HistamineExcitatoryHistidineHistidine decarboxylase TransportersATPExcitatoryADPMitochondrial oxidative phosphorylation + glycolysis Hydrolysis to AMP and adenosineNeuropeptidesExcitatory + InhibitoryAmino acidsSynthesis and transport Proteases*n (nicotinic) & m (muscarinic) Cholinergic System CNS = modulator PNS = signaler & modulator Nicotinic cholinergic receptor = excitatory Neuromuscular junctions Muscarine cholinergic receptor = inhibitory Heart, smooth muscle, exocrine glands Glutamatergic System Non-essential amino acid Do not cross BBB Fast & slow excitatory NMDA receptor = voltage gated Mg2+ blocking system Require co-agonist = NMDA Mg2+ block hyperpolarization; not depolarization GABAergic System Fast & slow inhibitory Hyperpolarization GABA-A & GABA-C receptors = chloride GABA-B receptors = potassium Not an essential metabolite = not part of proteins Glucose – Glutamate (TCA) – GABA (with enzyme and co-factor) Co-factor = Vitamin B6 Glycinergic System Inhibitory = hyperpolarization by chloride Derived from diet and serine Tetanus Inhibit SNAREs & SNAPs = glycine can’t be release Biogenic Amine System Modulatory – excitatory Five amines Catecholamines Norepinephrine Epinephrine Dopamine Serotonin Histamine Cofactors B12, folate, SAMe Chapter 5-2 1. Action potential Excitatory neurotransmitter = glutamate Bind ligand-gated sodium channel receptors Sodium flow down its electrical & concentration gradients Depolarize membrane = excitatory postsynaptic potential (EPSP) Exceed threshold Initiation phase = high increase in sodium conductance Depolarization phase Accumulation of positive charge (sodium ions) = inactivate sodium channel Simultaneously open voltage-sensitive potassium channels Repolarization phase Absolute refractory period = immune to any action potentials Hyperpolarization Relative refractory period 2. Neural transmission Depolarization opens voltage-gated sodium channels adjacent Succession of action potentials Opens N-type voltage-sensitive calcium channels at axon terminal Chapter 5-3 1. Spatiotemporal summation of neurons Neuronal action potentials are spatially weighted and over time Chapter 5-4 1. Propagation of unmyelinated axons Current is attenuated by resistance and capacitance Unmyelinated action potentials = 1m/sec 2. Myelin and action potential propagation Capacitance of myelinated axon is less Undergo salutatory conduction 3. Conduction block from myelin destruction Multiple sclerosis Lesions form = recurrent autoimmune inflammatory attach at myelin Remyelination reduces capacitance and leakiness Guillain-Barre syndrome Autoimmune response for myelin antigen Occur after infection Inflammatory damage to myelin in PNS Chapter 5-5 1. Sodium-potassium pump Sodium and chloride increase within cell from membrane permeability Restored by S/P pumps = require ATP Sodium out = potassium in Division 2 Chapter 6-6 1. Motor unit Combination of one aš-motoneuron and its muscle fiber 2. aš-motoneuron somatotopic organization Located in ventral horn of spinal cord Form column of cells in ventral horn Dendritic tree in ventral horn and junctional zone Axons through ventral roots  spinal nerves  peripheral nerves  muscle fibers Medial ventral horn Supply axial and proximal limb muscles Lateral ventral horn Supply peripheral limb muscles 3. Trophic influence of aš-motoneuron Axotomy Neighboring aš-motoneurons sprout axon to muscle Chapter 6-2 1. Recruitment With increased force from muscles Incease in small aš-motoneurons firing Increase numbers of larger aš-motoneurons Slow rates then fast rates (in maximal force) 2. Electromyography Amplitude and duration of motor unit potentials Recruitment patterns Lou Gehrig s Disease Fasciculation potentials Irregular, broad, high amplitude, multiphasic potentials Chapter 6-3 1. Reflex arc with aš-motoneuron and Ia sensory afferent projections Group Ia afferents Terminate in annulospiral endings of nuclear region Rate of muscle stretch Group II afferents Terminate in intermediate region Muscle length Myotatic reflex arc Muscle stretches = stimulate sensory nerves Excitatory input to a-motoneuron = resist stretching force Prevent further muscle lengthening 2. Upper motor neuron and lower motor neuron lesions Lower motor neuron lesions Cause hyporeflexia Higher motor neuron lesions Presynaptic inhibition lost Spasticity Hyperactive deep tendon reflexes = increased dynamic tone Augmented length-dependent resistance = increased static tone 3. Jacksonian principle Higher centers bring sophistication to neuronal processing and inhibit lower centers 4. Golgi tendon organs and type Ib afferent fibers Feedback to aš-motoneuron Increased muscle fiber tension = increased inhibitory to aš-motoneuron Information to CNS Ib afferent inhibit motoneuron of homonymous and heteronymous muscles Excite neurons to antagonist muscle Chapter 6-4 1. Spinal agonist-antagonist circuits and ventral horn Group Ia afferents excite aš-motoneurons Homonymous muscles Synergistic (agonist) muscles Inhibitory interneurons  to aš-motoneurons of antagonist muscles Nociceptive flexion reflex afferent fibers Group III & IV = muscles Group Adš & C = skin Excite flexor aš-motoneurons Inhibit extensor aš-motoneurons Reflex inhibited by cerebral and brainstem systems 2. Babinski sign and triple flexion responses Extensor plantar response Right foot stimulated, great toe extends (goes up) Normal = great toe curls down Damage to cerebral cortex and medullary reticular formation Disinhibition of nociceptive flexion reflex Triple flexion response Flexion at ankle, knee, and hip 3. Spastic catch Clasped knife reflex Disinhibition of Golgi tendon organs sensitive to muscle tension 4. Signs of lesions and localization Deep tendon reflexes C5-C6 = biceps, brachioradialis C7 = triceps L2-L4 = knee jerks S1 = ankle jerks Chapter 6-5 1. Distributed representation of the motor system Movement by multiple systemic interaction Cortical – brainstem – spinal – segmental Cerebrum Precise with great speed in production of internal movements Slow with reactive movements Incapable of two simultaneous movement programs Brainstem & spine Great reactive speed 2. Renshaw cells Regulation of information processing in motor systems of spinal cord Glycinergic inhibitory interneurons Synapse on homonymous and heteronymous aš-motoneurons Dampen neural noise not related to sensory stimulation or motor action Chapter 6-6 1. Ventromedial & lateral tract groups Ventromedial tracts Innervate axial & limb girdle musculature Actions of axial and proximal muscle groups & posture and tone Lateral corticospinal tract Major lateral tract Innervate distal musculature Precision movements of distal extremities (hands) Ventromedial tracts Except tectoreticulospinal tract Favor extensor tone (antigravity) Lateral corticospinal tract = minimal on tone Most synapse with interneuron of ventral horn or junctional zone Interneuron synapse to aš- & gš-motoneurons and Group Ia & II IPSI Lateral corticospinal tract synapse directly to aš- & gš-motoneurons in arm and hands CONTRA = 90% @ medullary pyramidal decussation IPSI = 10% 2. Lesions on balance pathways Vestibulospinal system Antigravity tone maintenance, posture, & balance Parkinson’s disease 3. Decorticate and decerebrate patients with lesions of pons and above pons Decerebrate posturing = lesion at pons Disinhibition of vestibulospinal and caudal pontine reticulospinal systems Profound extensor tone Decorticate posturing = lesion at or above level of midbrain Disinhibition of cortical drive to brainstem motor systems Flexion and pronation of upper extremity Extension of lower extremity 4. Spinal shock and chronic spinal cord lesions Spinal shock = acute lesion Flaccid muscle tone Absent deep tendon reflexes No plantar responses Chronic lesions of motor systems Hyperactive muscle stretch reflexes Increased deep tendon reflexes Extensor plantar responses Summary Vestibulospinal tract Antigravity tone Posture Medullary & Pontine Reticulospinal tracts Travel down brainstem and spinal cord – terminate at spinal segments Flexor (medullary) & extensor (pontine) muscle tone Posture Immobilize proximal portion of extremities Tectoreticulospinal tract Deep superior colliculus – a- & g-motoneurons in cervical spinal cord Deep layer = visual, auditory, and somatosensory input Superficial layer = define targets for movement Reactive movements of eyes and head Lateral Corticospinal tract Pyramidal cells of BA 4 Execution of precise movements (especially the hands) Independent finger movement Chapter 6-7 1. Bladder function and bowel control Innervated by ANS Detrusor muscle = empty bladder Parasympathetic control Inhibition = pontine reticular formation via pontine reticulospinal tract Internal sphincter muscle = restrict urine through bladder neck Sympathetic Lower motor neuron bladder = lesions of spinal cord, sacral parasympathetic, paravertebral ganglia Detrusor = large, flaccid bladder, poor emptying Sphincter = overflow incontinence during increase abdominal pressure Upper motor neuron bladder = lesions above nerves innervation detrusor Detrusor = small capacity, spastic bladder Sphincter = difficulty emptying bladder, urgency incontinence Chapter 6-8 1. Major components of cerebral motor system Precentral gyrus = pyramidal neurons of layer V Afferent to BA 4 = Premotor cortex and supplementary motor area (IPSI) Receive input from muscle spindles Area 4 & 6 = input from VL nucleus of thalamus (relay to putamen and cerebellum) Basal ganglia & cerebellum = consultants to cerebral cortical systems 2. Corticospinal tract BA 4 – corona radiata – genu and internal capsule – cerebral peduncles  basis pontis Longitudinal fibers of ventral pons  medullary pyramids  decussation of pyramids (90% cross) Dorsolateral of contralateral spinal cord (90%) & ventromedial of ipsilateral spinal cord (10%) Exit on interneurons or aš-motoneurons in ventral horn 3. Major brainstem and spinal cord input from corticospinal projections Corticobulbar fibers Terminate on interneurons of cranial nerve motor nuclei from midbrain to medulla Red nucleus Pontine and medullar reticulospinal centers 4. Somatotopic organization of corticospinal system Brainstem and spinal cord Face fibers = medial Leg fibers = lateral Arm fibers = intermediate Extensive fibers for face and upper extremities 5.Cerebral lesions and its involvement in arm and hands Common infarction of middle cerebral artery distribution even with collaterals Arm and face regions of motor homunculus Corticospinal and corticobulbar fibers travel through corona radiata Except in periventricular region No somatotopic organization of corticobulbar/corticospinal fibers 6. Microscopic representation of movements in area 4 Corticospinal system = supervisory system Suppress background muscle tone of other systems Collateral projections Deep superior colliculus (tectospinal tract) Red nucleus (rubrospinal tract) Pontine and medullar reticular formation (reticulospinal tracts) Each corticospinal fiber project to aš-motoneurons of principal target muscle, inhibitory neurons, etc 7. Supplementary motor area and dorsolateral premotor cortices Supplementary motor area = parasagittal Generation of practiced movement sequences Premotor area = dorsolateral Development of movement sequences Receive visual and somatosensory cortices Chapter 6-9 1. Major structures of basal ganglia Caudate nucleus Putamen Globus pallidus Substantia nigra pars reticulata (SNPR) Substantia nigra pars compacta (SNPC) Subthalamic nucleus (STN) 2. Two major basal ganglia circuits Direct Cortex – striatum – GPi/SNPR – thalamus – cortex Indirect Cortex – STN – GPi/SNPR – thalamus – cortex Glutamate = excitatory Cortical neurons project to striatum & STN STN neurons Thalamic neurons relaying back to cortex GABA = inhibitory Striatum neurons GPi/SNPR neurons 3. Lesion locus of diseases Parkinson’s disease Striatal dysfunction = putamen Loss of dopamine Hypophonia = quiet voice Hypokinesia = small movements Festination = fall forward Pill-rolling = tremor of forearm and hand Akinesia = silent and immobile Bradykinesia = slow to execute commands Huntington’s disease Frontal lobe and basal ganglia (caudate nucleus) Lack of inhibition = primarily direct route Inappropriate behavior Chorea = lilting gait Choreoathetosis Globus pallidus = carbon monoxide poisoning Lack of inhibition = direct route Uncontrollable inappropriate movements Constant, sinuous, writhing movements of arms, hands, head, and legs Chorea during walking Hemiballismus Stroke to subthalamic nucleus Loss of excitatory input from STN to cells of GPi = loss of inhibition to Vlo Paroxysmal surges in area 4 = violent movements Loss of indirect basal ganglia pathway Chapter 6-10 1. Four major cerebellar subsystems and function Vermis = midline Linked to fastigial nucleus Intermediate zone = paramedian Linked to interpositus nucleus Hemispheres = lateral Linked to dentate nucleus Flocculonodular lobe Linked to vestibular nuclei Purkinje cells = inhibitory Project to cerebrum, brainstem, and spinal cord IPSI Inferior cerebellar peduncle Spinal cord afferents enter cerebellum Middle cerebellar peduncle Afferent projections from cerebrum relay by basis pontis Superior cerebellar peduncle Cerebellar projections to cerebrum\ 2. Lesions of cerebellum Degeneration of cerebellar vermis Chronic alcohol Unbalance in legs Hand coordination is fine Paraneoplastic cerebellar degeneration of Purkinje cells Strength normal Hypermetric saccades = eye movements jerky Dysmetria = unable to hit target with finger Truncal titubation = swing side to side while sitting Chapter 7-1 1. Major somatosensory receptors Proprioception Physical sense of position and movement of limbs Group Ia & II afferent systems Proprioception in proximal extremities (arms) Ruffini endings Proprioception in distal extremities (hands) Collagen fibrils in skin Mechanoreception Touch Superificial dermis Merkel disks Slow adapting receptors Skin deformation Meissner’s corpuscles Rapidly adapting Movement of skin (slippage) Deep dermis Ruffini endings Slow adapting receptors Detect skin stretch Hands and feet Pacinian corpuscles Rapidly adapting Vibratory stimuli Thermoreception Range 0o to 40o & 30o to 48o Cross at body temperature 37o Detect absolute temperatures 30o to 48o Nociception Mechanical/thermal nociceptors High intensity stimuli Rapid transmit to CNS via lightly myelinated Adš Highly localized pain Polymodal nociceptors High intensity mechanical stimuli Exogenous chemical stimuli Endogenous chemical stimuli Thermal stimuli Slow transmit to CNS via unmyelinated C fibers Poorly localized Visceral pain system Stretch or distention Transmit to CNS via DRG & CN X Chapter 7-2 1. Protopathic and epicritic systems Protopathic Temperature and pain Small, slow conducting fibers Low spatial and temporal dispersion Lateral spinothalamic tract Epicritic Proprioception, touch, and vibration Large myelinated fibers High spatial and temporal resolution Dorsal & dorsolateral columns 2. Dorsal root ganglia Spinal cord levels more rostral than vertebral levels from cranial to caudal No dendrites Pseudounipolar Receptive fields Low threshold, large-diameter, epicritic fibers = small (hands) High threshold, small-diameter, protopathic fibers = large Dermatomes Region of skin supplied by one dorsal ganglion 3. Spinal segmental neural systems, spinal cord, and brainstem pathways Protopathic sensory fibers Enter dorsally by Lissauer’s tract Adš and C fibers of protopathic system Terminate at lamina I & II Crosses anterior commissure to contralateral ventrolateral white matter Ascend spinothalamic tract Brainstem & thalamus Medullary, pontine, & midbrain reticular formations Arousal and muscle impact from pain Periaqueductal gray matter Regulation of pain VPL of thalamus Localization and quantitative analysis of pain Epicritic sensory fibers Enter ipsilateral dorsal column Enter dorsal horns to ventral regions Or Travel uncrossed rostrally in ipsilateral dorsal column Dorsal column nuclei at cervico-medullary junction Gracile fasciculus (T6) & cuneate fasciculus Chapter 7-3 1. Primary somatosensory cortex and association cortex Occupies nearly all postcentral gyrus First Somatosensory Area (SI) Brodmann’s AreaSensory Afferents Function3aMuscle & nociceptive (via thalamus)Proprioception Pain 3bSlowly & rapidly adapting cutaneous input (via thalamus)Tactile Vibration Thermal 1Slowly and rapidly adapting cutaneous from area 3b Texture2Cutaneous from area 3b Nociceptive and muscle from area 3a Position, size, 3-D shape Pain Second somatosensory area Projections from thalamus Shape & texture Linked by transcallosal connections 2. Graphesthesia and localization Graphesthesia = ability to identify numbers traced on the body surface Afferents ascend via dorsal columns BA 5 & 7 = somatosensory from area 2 BA 7 = visual association Chapter 7-4 1. Trigeminal peripheral trajectories Nuclei in trigeminal ganglion Floor of cavernous sinus Ophthalmic Forehead – eyebrows – eye – nose Meninges & dura of supratentorial compartment Superior orbital fissure Maxillary Central face – lateral nose – upper lip – cheeks – mouth Foramen rotundum Mandibular Chin – lower lip – mandible – floor of mouth – tongue Foramen ovale 2. Three major brainstem trigeminal nuclei Spinal nucleus of V Caudal pons to C2 of spinal cord Merge with lamina I & II of dorsal horn Project across brainstem to trigeminothalamic tract Travel dorsal to medial lemniscus = reticular formation & periaqueductal gray Terminate in VPL of thalamus Chief sensory nucleus of V Epicritic fibers Lateral pons rostral to spinal nucleus Project rostal to trigeminothalamic tract Terminate in contralateral VPL nucleus of thalamus Relay cells in VPL project to postcentral gyrus Via genu of internal capsule & corona radiata Motor nucleus of V Muscles of masatication & extraocular muscles Mesencephalic nucleus of V Lateral midbrain Jaw reflexes 3. Headaches Trigeminal terminals in meninges & microvasculature Pain due to destruction of meninges Chapter 7-5 1. Two major anti-nociceptive descending spinal cord systems Serotonergic system Inhibitory interneurons = enkephalinergic  mš-opioid  dynorphin receptors Synapse to nociceptive C fibers Synapse to excitatory interneurons of nociceptive relay transmission Synapse to spinothalamic tract fibers Opioids Serotonergic & nonserotonergic fibers Raphe magnus nucleus & ventromedial medulla from periaqueductal gray Noradrenergic system Locus ceruleus DLPT (pontine) Target aš2-noradrenergic receptors Potassium ionophore 2. Gate control theory of pain modulation Nociceptive C fiber transmission suppression By enhance myelinated fiber afferent transmission Inhibitory neurons in dorsal horn = input from myelinated peripheral nerves Nerve stimulators to treat pain 3. Pain perception and pain experience Suffering = afferent nociceptive transmission Cerebrum and limbic system Attach value to the experience Chapter 7-6 1. Ectopic impulse Spontaneous generation of action potentials Sites of axonal demyelination High density of voltage-sensitive sodium channels in demyelinated membrane Depolarization outlasts refractory period Antidromical impulse Postherpetic neuralgia = local reactivation of herpes zoster Follow dermatomes 2. Suppression of ectopic impulse generation Phenytoin = binds inactivated voltage-sensitive sodium channels Inhibit action potentials and ectopic impulse generation 3. Dorsal root ganglion follow nerve injury Increased density of sodium channels in Ašbš neurons Low threshold, fast conduction, non-nociceptive Enhancement of sodium channels conductivity Increased growth factors in neurons, Schwann cells, and macrophages Induce vasculation of dorsal root ganglion Increased expression of aš1-noradrenergic receptors Polymodal nociceptive afferent neurons Chapter 7-7 1. Wind-up Central sensitization Hypersensitivity to pain in dorsal horn Constant release of glutamate by C fiber nociceptive afferent endings Co-transmittors = substance P & CGRP Strengthen connections between nociceptive afferent fibers & dorsal horn neurons 2. Pathologic learning Chronic input from nociceptors & central cells Repetitive transmission of ascending nociception Expansion of receptive fields Loss of specificity by neurons Chapter 8-2 1. Olfactory apparatus and targets in cerebrum Receptor cells Between cribriform plate and mucosa of nasopharynx Olfactory expithelial cells synapse within olfactory bulb Olfactory glomerulus – olfactory tract Terminate in pyriform cortex of amygdala and entorhinal cortex Projections to orbitofrontal cortex via thalamus Chapter 8-3 1. Extraocular muscles and levator palpebrae Control of Ocular Movements Cranial NerveNomenclatureMusclesAction on Eye IIIOculomotorSuperior rectus SupraductionInferior rectus InfraductionMedial rectus AdductionInferior ObliqueExtortion Supraduction Levator palpebra Elevation of upper eyelidPupillary sphincter Pupillary constrictionIVTrochlearSuperior obliqueIntortion Infraduction VIAbducensLateral rectusAbduction  Chapter 8-4 1. Conjugate horizontal eye movements Neural yoking mechanisms Abducens project to contralateral Oculomotor nucleus via MLF Contraction of LR & contralateral MR 2. Internuclear ophthalmoplegia (INO) Normal abduction of one eye Deficient adduction of contralateral eye Lesion between oculomotor & abducens nuclei MLF lesion or multiple sclerosis 3. Vertical eye movements Trochlear nuclei = SO Oculomotor nuclei = IR & IO 4. Near triad Vergence Accommodation Pupillary constriction Ocular vergence Pretectal area = superior colliculi Direct contraction of MR without MLF 5. Vestibulo-ocular reflex Vestibule of inner ear = constant signal to medial vestibular nucleus Tonic inhibitory input to abducens nuclei & midbrain vertical eye movement network Head turns to opposite side = tonic vestibular input reduced Eyes deviate to side of reduced input 6. Voluntary & reflexive gaze mechanisms & orienting responses Gaze = conjugate movement (saccades) Frontal eye fields & superior colliculi Smooth pursuit Superficial superior colliculi = directed & reactive saccadic eye movements Paramedian pontine reticular formation (PPRF) Frontal eye fields & superior colliculi project to PPRF Activity in LEFT frontal eye field = Firing of RIGHT abducens nucleus Conjugate saccadic movements to right 7. Ocular smooth pursuit Temporal & parietal lobes – frontal eye fields & brainstem – IPSI vestibular nuclei – IPSI FN cerebellar lobe – IPSI abducens Smooth pursuit in LEFT hemisphere = control smooth pursuit to LEFT 8. Optokinetic & vestibular nystagmus Mixture of saccades & smooth pursuit Optokinetic = target moving Vestibular = subject moving Chapter 8-5 1. Motor component of CN V Located in lateral pontine tegmentum = Junction of middle and caudal pons Follows mandibular division of CN V Innervate muscles of mastication Lesion = inability to thrust mandible to contralateral side Bilateral supranuclear innervation Lesions of hemispheres = no effect on mastication Chapter 8-6 1. Motor nuclei of CN VII, IX, and X CN VII Located in entrolateral tegmentum of caudal pons Enter IAC – stylomastoid foramen Muscles of facial expression Dorsal = lower face (CONTRA via corticobulbar) Ventral = upper face (BI via corticobulbar) CN IX & CN X Nucleus ambiguous = swallowing (dependent) Paramedian rostral medulla – dorsal to inferior olive Bilateral via corticobulbar tract CN IX = stylopharyngeus CN X = muscles of pharynx, larynx, & palate 2. Upper & lower motor neuron CN VII palsy Upper motor neuron Weakness of muscles of facial expression in LOWER face No dysfunction in upper face Lower motor neuron Weakness of entire hemiface 3. Corneal reflex V1 trigeminal afferent fibers = unmyelinated & nociceptive Spinal nucleus of V = project to reticular formation = CN VII nuclei (BI) motoneurons = efferent 4. Somatosensory function of CN VII, IX, and X CN IX & X Solitary tract = sensation in pharynx & afferent to nucleus ambiguous (swallow) CN VII, IX, X Innervate middle ear, external auditory meatus, & pinna Pain, temperature, & touch Project to CN V via spinal nucleus 5. Taste functions of CN VII, IX, and X Nucleus Solitary CN VII = anterior 2/3 tongue CN IX = posterior ½ tongue CN X = taste to epiglottis 6. Autonomic efferent functions of CN VII, IX, and X Salivatory Nucleus CN VII = lacrimal gland, nasal and oral mucous membranes, sublingual, & submandibular glands CN IX = parotid salivary gland Dorsal Efferent Nucleus of Vagus CN X = parasympathetic to thoracic & abdominal viscera 7. Visceral autonomic afferent functions of CN IX and X CN IX Baroreceptor at carotid sinus CN X Baroreceptor in left ventricle of heart & aortic arch Project to medullary cardiovascular center Chapter 8-7 1. Pathway of CN XI Exit between dorsal and lateral roots – through foramen magnum – jugular foramen Innervate sternocleidomastoid and trapezius muscles Superficial of posterior triangle of neck IPSI Chapter 8-8 1. Hypoglossal nerve CN XII Nucleus = dorsomedial medullary tegmentum Exit lateral to medullary pyramid – hypoglossal foramen Form major part of lingual nerve Innervate muscles of tongue and salivary glands Supranuclear innervation of hypoglossal nuclei = CONTRA hemisphere Supranuclear lesions = tongue deviates to opposite side Infranuclear lesions = tongue protude to side of lesion Supranuclear Innervation of Cranial Nerve Motor Nuclei Cranial NerveFunctionSupranuclear Innervation III IV VI Eye movements Gaze Smooth Pursuit CONTRA IPSIVMasticationBI – redundant VIIForehead Lower faceBI – redundant CONTRA IX X SwallowingBI – dependentXIHead turning (sternocleidomastoid) Shoulder shrugIPSI CONTRA XIITongueCONTRA  Chapter 9-2 1. Retinal layers and light pathway Cornea – aqueous humor – pupil – lens – vitreous humor – RETINA Retina: nerve fiber – ganglion cell – inner plexiform – inner nuclear – outer plexiform – outer nuclear layer 2. Visual perimetry Fovea = locus of highest visual acuity Few or no cells between photoreceptors & vitreous humor 3. Blind spot Optic head = point at axons of ganglion cells form optic nerve No photoreceptors Chapter 9-3 1. Optic pathway from eyes to calcarine cortex Retinal ganglion cells – optic nerve – optic chiasm – optic tract – lateral geniculate nucleus (or superior colliculus) Optic radiations – Calcarine fissure – calcarine cortex (BA 17) 2. Visual field cortical locations Right/ Left Myer’s loop = Left/ Right superior visual fields Inferior calcarine cortex Central macula = most posterior calcarine cortex Occipital pole Peripheral visual field = most anterior calcarine cortex 3. Retinotopic mapping Systematic mapping of visual fields 4. Visual association cortices Entire occipital lobe (BA 17, 18, 19) Middle & inferior temporal gyri Undersurface of temporal lobe (BA 20, 21, 37) Superior & medial parietal cortex (BA 7) Chapter 9-4 1. Retinal ganglion cells & photons Photon travel through transparent cellular layers to photoreceptor layer Tubular extensions of receptor cells in parallel to incoming light Stack of disks with rhodopsin Rhodopsin Membranous protein opsin + retinal Need vitamin A = retinal Photon induce opsin conformation change to trans (active state) Opsin converts cGMP to GMP Shut tonically releasing CNG (Ca2+) channels Hyperpolarize neuron 2. Rod & Cone photoreceptor system Rod photoreceptor Low light condition No color Throughout retina (none in fovea) Many rods to a ganglion cell Low visual acuity High receptive field Cone photoreceptor Moderate to full light Color sensitive Concentrated in macula (and fovea) Few cones to a ganglion cell High visual acuity Small receptive field 3. Mechanisms of response to ambient light Constriction of pupil Rods and cones differ in sensitivity Photoreceptors alter sensitivity Neural mechanisms of retina, LGN, & visual cortices maximize sensitivity Feature enhancement 4. Contrast sensitivity of visual system Center-surround response Respond maximally when illumination differs in center from periphery of receptive field 5. Physiologic basis for color perception & color blindness Cone photoreceptors = short, medium, & long wavelength Blue-violet, green, & yellow Color-blindness Abnormality in one or more classes of cone photoreceptors Protanopia No Long-wavelength pigment Sex linked Deuteranopia No Medium-wavelength pigment Sex linked Tritanopia No Short-wavelength pigment 6. Motion perception Center-surround contrast sensitivity is time-delimited Prevalent in V1 7. “What” & “where” visual systems Segregated starts in LGN and beyond V2 “What” = Temporal Perception & recognition of objects Color & form Expansion of receptive fields of visually responsive neurons No retinotopic organization Increase stimulus response Increase stimulus response complexity Prior experience shapes responses “Where” = Parietal Motion & location tasks Chapter 9-5 1. Pupillary reaction to light Optic nerve detect light = afferent arc Travel to superior colliculi Project to Edinger-Westphal nucleus of CN III BILATERAL = efferent arc Direct response & consensual response Chapter 9-6 1. Papilledema Swelling of axons at optic nerve head Increased intracranial pressure Communicated via subarachnoid space Bilateral swelling Chapter 9-7 1. Vasculature of eye Supraclinoid internal carotid artery – ophthalmic artery – central retinal artery Inner retinal layer 2. Amaurosis fagax Showers of platelet-fibrin emboli transverse ophthalmic artery Transient loss of vision Chapter 10-1 1. Structures of outer, middle, and inner ear Outer ear Pinna Gather sound waves into ear canal Localization of sound along vertical axis Binaural hearing help hear in noisy environment External auditory meatus = ear canal Air conduit to middle ear & tympanic membrane Middle ear Behind tympanic membrane Reflex = activated by loud noise & vocalization Malleus Lever arm longer than incus Incus Tensor tympani = CN V Stapes Stapedius muscle = CN VII Stapes cover oval window Tympanic membrane = larger than oval window Inner ear Within petrous portion of temporal bone Auditory portion = Cochlea Perilymphatic space Vestibular portion Semicircular canals Attached to utricle & saccule 2. Infection of middle ear Eustachian tube = middle ear Otitis media Destroy binaural enhancement of hearing Delayed language development Link to nasopharynx 3. Blood behind tympanic membranes & acute hearing loss Blood from fractured petrous bone Middle ear 4. Meniere’s syndrome Membranous labyinth Endolymph = high in K+/ high voltage Endolymphatic hydrops = problems with drainage of endolymph Endolymphatic pressure increase Tinnitus & vertigo 5. Innervation Cochlea = spiral ganglion Auditory nerve = IAC Terminate in rostral medulla Vestibular = Scarpa’s ganglion Chapter 10-2 1. Cochlea structures Scala vestibuli Perilymph Direct extension of vestibule Moves perilymphatic fluid along scala vestibuli Helicotrema = communicates with scala tympani Cochlear duct Endolymph Stria vascularis = outer wall of cochlear duct Production of endolymph Reissner’s membrane = separate scala vestibuli from cochlear duct Organ of Corti Base has two strips of hair cells Direct translation of movement to neural firing Tectorial membrane = gelatinous unstretchable overlying membrane Scala tympani Perilymph Movement occurs by cochlear duct Terminates at round window Chapter 10-3 1. Sound waves into frequency-specific oscillations of basilar membrane Sound waves translated into movement of stapes By ossicles Tympanic membrane 35x larger than oval window 2. Basilar membrane oscillation translated to tectorial membrane and cochlear hair cells Perilymph = incompressible Stapes push fluid into scala tympani via helicotrema Shifts cochlear duct, basilar membrane, & organ of Corti Round wind compensates Translated into vibratory movements Stapes – basilar membrane – cochlear duct – organ of Corti Cochlear is heterogenous Base near oval window = thick & stiff Resonate high frequencies Apex near helicotrema = thin & pliable Resonate low frequencies Chapter 10-4 1. Hair cell vibration into auditory nerve firing Stereocilium = hollow cylinder with actin cytoskeleton (crosslinked by fibrin) Tip link = elastic fiber linking stereocilium to its taller neighbor Tension opens nonspecific cation channel = mechanical event Displacement of sensory Toward tallest stereocilia = stimulatin & depolarization Away tallest stereocilia = inhibition & hyperpolarization 2. Aminoglycoside ototoxicity Aminoglycosides concentrated in endolymph Damage mitochondria Excessive loss of hair cells = becomes deaf Chapter 10-5 1. Auditory pathway to primary auditory cortex NCSLIMA Spiral ganglion – cochlear nuclei – superior olivary nucleus – lateal lemniscus – inferior colliculus – medial geniculate – auditory cortex (BA 41,42) Unilateral lesion No effect from cochlear nuclei to Heschl’s gyrus Chapter 10-6 1. Sound localization Superior olivary nuclei Sensitive to sound arrival and intensity differences Primarily detecting higher frequency sounds 2. Sound sequence decoding Tonotopic organization = highest frequencies at one end of A1 and lowest frequencies at the other 3. Neural plasticity Nucleus basalis of Meynert = associate value to action in order to learn Dominance in cortex from repetitive listening to a specific tone Chapter 10-7 1. Vestibular anatomy of inner ear Membranous labyrinth Saccule, utricle, & 3 semicircular canals Contain endolymph Saccule & utricle = contain otolithic organ (sensitive to linear acceleration) Crista ampullaris = detect angular acceleration of endolymph of semicircular canals 2. Linear acceleration Macula = sheet of hair cells Both hair cell types are sensory transduction cells Differ than auditory (inner & outer cells) Otolithic membrane = hair cells stereocilia insert into membrane Calcium carbonate crystals embedded = inertia Saccule = sagittal plane Utricle = axial plane 3. Angular acceleration sensed by inner ear Three perpendicular semicircular canals Communicate with utricle Cupula linked to hair cells of crista ampullaris Chapter 10-8 1. Vestibular pathway Scarpa’s ganglion – hair cells of otolithic organs & crista ampullaris – IAC – CN VIII – vestibular nuclei – BA 7 Chapter 11-1 1. Hypothalamus Rostal, ventral portions of third ventricle Extend to lamina terminalis Inferior border Optic chiasm Median eminence Mammillary bodies 2. Hypothalamus transmission Neural mechanism Hormonal mechanism By cumventricular organs (CVOs) & pituitary gland Hypothalamic-pituitary portal system Subfornical organ = neurons have receptors for angiotensin II Thirst 3. Routes of hypothalamus influence Connections to autonomic & neuroendocrine systems 4. Efferent components of ANS that receive hypothalamic projections Sympathetic Parasympathetic CN III, VII, IX, X, intermediate zone of spinal cord Solitary tract 5. Cerebral structures projecting to hypothalamus Limbic system Amygdala Lateral septal nuclei Insular cortices 6. Neurohypophysis & adenohypophysis Neurohypophysis Oxytocin Vasopressin Adenohypophysis ACTH GH TSH LH FSH Prolactin Hormonal feedback CVOs (median eminence of lamina terminalis) Intermediate & posterior lobes of pituitary gland Steroids = diffusion 7. Major hypothalamic regulatory functions Maintenance of body mass Body temperature Blood volume Plasma osmolalitry Circadian rhythms 8. Hypothalamical drives Limbic system Hunger, thirst, sexual drive Tract Systems PathwayOriginCourseTerminationLateralityModalities  Dorsal Column/ Medial Lemniscal 1. DRG1. Fasiculus gracilis/cuneatus1. Nucleus cuneatus (upper body) Nucleus gracilis (lower body) 1. IPSI Light Touch Vibration Proprioception 2. Nucleus gracilis/cuneatus 2. Medial Lemniscus2. VPL of Thalamus2. CONTRA3. VPL of Thalamus3. Posterior limb of internal capsule3. Primary Somatosensory Cortex (BA 3,1,2) 3. IPSI Anterolateral/ Spinothalamic 1. DRG1. Dorsal Root1. Substantia gelatinosa 1. IPSI Pain Temperature2. Rexed Lamina I or V2. Ventral white commissure, Spinothalamic tract 2. VPL of Thalamus2. CONTRA3. VPL of Thalamus3. Posterior limb of internal capsule3. Primary somatosensory cortex (BA 3,1,2) 3. IPSI Corticospinal Primary motor cortex (BA 4)Posterior limb of internal capsule, PyramidsVentral horn of spinal cordCONTRA (lateral) IPSI (anterior)Fine Motor Control Slight Flexor Bias Rubrospinal Red nucleusDorsolateral white matter with LCST in spinal cord Ventral horn of cervical Spinal cordCONTRA (cross immediately in ventral tegmental decussation)Gross movements of upper extremities Flexor bias TectospinalSuperior colliculusVentral to MLF, To ventromedial spinal cordVentral horn of cervical Spinal cordCONTRA (cross immediately in dorsal tegmental decussation)Reflexive movement of head and neck Associated with eye movements  VestibulospinalLateral/ Medial vestibular nucleiMVST: within MLF below VI and ventromedial spinal cord LVST: From brainstem to ventromedial spinal cord MVST: Ventral gray, cervical & high thoracic LVST: ventral gray, all levelsMVST: Bi LVST: IpsiMVST: balance of head and neck Extensor bias LVST: Balance of trunk, limb girdle, proximal limbs Extensor biasPontine ReticulospinalPontine reticular formationVentromedial spinal cordVentral gray of spinal cord, All levelsIPSIPostural/ axial movement & muscle tone Extensor bias Medullary ReticulospinalMedullary reticular formationLateral spinal cordVentral gray of spinal cord, All levelsBi with IPSI biasPostural/ axial movement & muscle tone Flexor bias CorticopontinePremotor, primary motor, & primary somatosensory cortexInternal capsule (A/P), Cerebral peduncles, Pons Pontine nucleiIPSIDescend info from cortex to pons To middle cerebellar peduncleCorticobulbarPrimary motor cortex (BA 4), face portionInternal capsule (genu), cerebral peduncle, Longitudinal fibers of pons, pyramidsMotor nuclei of cranial nervesCN III, IV, V, VI, IX, X (all CN except 1, 2, 8), VII (upper face), Ambiguus: Bi CN VII (lower face), XII, Reticular formation: CONTRA Red Nucleus: IPSI Motor inputVentral Spinocerebellar INPUTVentral gray of spinal cordVentrolateral spinal cord, medulla & pons, superior cerebellar peduncleGranule cells of vermis & intermediate zoneIPSI at termination (cross spinal cord & after entering cerebellum) Motor limb movement (intended vs. actual)Pontocerebellar INPUTPontine nucleiImmediately decussates & enter middle cerebellar peduncle Granule cells of cerebellar hemispheresCONTRAPlanning skilled movementsDorsal Spinocerebellar INPUTClarke’s column (T1-L2)Dorsolateral spinal cord & medulla, enters inferior cerebellar peduncle Granule cells of vermis & intermediate zoneIPSISensory limb movement (intended vs. actual)Olivocerebellar INPUTInferior olivary nucleusDecussates immediately & enters inferior cerebellar peduncle Purkinje cells of vermis & intermediate zoneCONTRALimb movement (intended vs. actual)Vestibulocerebellar INPUTVestibular nucleus (Vestibular ganglion) Inferior cerebellar peduncleGranule cells of flocculus & nodulusIPSIEye movement and balanceDentate & Interposed Nuceli OUTPUT Dentate & interposed nucleiSuperior cerebellar peduncle, decussate in brachium conjunctivum Red nucleus or VL nucleus of thalamusCONTRAEfferent mechanixm to cerebral cortex for limb motor planning, execution, and correction Fastigial Nucleus OUTPUTFastigial nucleusInferior cerebellar peduncleVestibular nuclei Or Reticular formationIPSIMechanism from vermis to influence vestibulospinal and reticulospinal tracts Flocculonodular Lobe OUTPUTFlocculus Or NodulusInferior cerebellar peduncle Or Direct to vestibular nucleus Vestibular nuclei Or Reticular formationIPSIMaintenance of equilibrium and coordination of eye movementsAuditory SystemSpiral ganglionCN VIII Cochlear nucleus Superior olivary nucleus Lateral lemniscus, Inferior colliculus, Medial geniculate Auditory cortex Auditory cortex BA 41 & 42 (Heschl’s gyrus)BIHearing “NCSLIMA”Vestibular SystemVestibular ganglionCN VIII (Vestibular portion) to Vestibular nucleiCerebellum (Vestibulocerebellar tract to FN Lobe) Spinal cord (Medial & Lateral vestibulospinal tract) Oculomotor Centers via MLF Cerebral cortex via thalamus VCT = IPSI MVST = BI LVST = IPSI Balance sensory 4 nucleiCN I Olfactory1. Olfactory epithelium1. Cribiform plate1. Olfactory Bulb 1. IPSI Smell (special sensory)2. Olfactory bulb2. Olfactory groove2. Amygdala, Entorhinal cortex, & Piriform cortex via olfactory stria 2. IPSICN II Optic1. Retinal Ganglion cells1. Optic nerve, optic chiasm, optic tract1. Lateral geniculate or superior colliculus 1. BI Vision (special sensory)2. Lateral geniculate or superior colliculus2. Optic radiations2. Primary visual cortex (BA17) or Ventral horn spinal cord via tectospinal tract 2. IPSI (visual cortex) or CONTRA (ventral horn)CN III OculomotorOculomotor nucleus (motor) Edinger-Westphal (Para) Interpeduncular fossa, Cavernous sinus, Superior orbital fissureSR, IR, MR, IO, Levator palpebrae, Constrictor pupillae (Para) and ciliary muscle IPSI Oculomotor nuclear complex ParasympatheticCN IV TrochlearTrochlear nucleusQuadrigeminal cistern, Ambient cistern, Cavernous sinus, superior orbital fissure Superior obliqueCONTRA MotorCN V TrigeminalMesencephalic nucleus Mesencephalic tractMotor Nucleus of CN VBISomatic sensory Somesthesis in face Motor nucleusV3 Mandibular branch through foramen ovaleMuscles of mastication, tensor veli palatini, anterior belly of digastric IPSIMotorTrigeminal (Gasserian) ganglionBranches of trigeminal nerve from head, face, meninges Chief Sensory nucleusIPSISomatic sensory Somesthesis in faceTrigeminal ganglionAll branches of trigeminal nerve, spinal trigeminal tract Spinal nucleusIPSISomatic sensory Somesthesis in faceVentral Trigeminothalamic Mesencephalic nucleus Spinal nucleus Chief sensory nucleus VTTT, with Medial lemniscusVPM of thalamusCONTRACN VI AbducensAbducens nucleusPontomedullary junction, Dorello’s canal, cavernous sinus, superior orbital fissure Lateral rectusIPSIMotorCN VII FacialSalivatory nucleusCN VII, through internal auditory canal (IAC), temporal bone, exit stylomastoid foramen Lacrimal, submandibular, salivary, and sublingual glandIPSIParasympathicGeniculate GanglionCN VII, enter stylomastoid foramen, temporal bone, IAC Nucleus SolitariusIPSITaste (ant 2/3) (special sensory)Motor nucleusCN VII, through IAC, temporal bone, exit stylomastoid foramen Muscles of facial expression, stapedius, posterior belly of digastric IPSIMotorCN VIII Vestibulocochlear V: Scarpa’s Ganglion & C: Spiral Ganglion CN VIII, through IACVestibular nuclei & Cochlear nucleiIPSIHearingCN IX Glossopharyngeal Glossopharyngeal ganglion CN IX Through jugular foramenNucleus solitarius IPSITaste (post 1/3) (special sensory) Nucleus Ambiguus Stylopharyngeus muscleMotorSalivatory nucleus Parotid glandParasympatheticPathwayOriginCourseTerminationLateralityModalities CN X Vagus Nucleus Ambiguus CN X Exit jugular foramenMuscles of larynx, pharynx, palate  IPSIMotorDorsal efferent nucleus of Vagus Esophagus, trachea, digestive organs, heart ParasympatheticAfferent ganglion of Vagus Nucleus SolitariusSensoryCN XII Hypoglossal Hypoglossal nucleusHypoglossal canal Muscles of the tongueIPSIMotor Division 3 Chapter 12-2 1. Sensory association cortices Sensory association cortices Serve as way stations to supramodal cortices Apperceptive visual agnosia Stroke of occipital & posterior temporal lobes = bilaterally Bilateral posterior cerebral artery occlusion Present macular & peripheral field vision Higher order visual inhibited Color loss = bilateral strokes of medial portions of posterior temporal lobes 2. Distributed representation of visual, auditory, and somatosensory modalities. Color/form “what” damage of visual system Bilateral occipitotemporal stroke “Where” functional Cortical LobeFunctionInstigator Occipital & posterior temporalVisual agnosia Loss of high order visual processing Cannot copy drawingStrokeMedial posterior temporal (Bilateral) Loss of color vision (V4)Bilateral strokePosterior temporalLesion of “what” pathway Disconnection from limbic system Loss of aesthetic appreciationBilateral hematomas after accident Chapter 12-3 1. Phonology distributed representations Supramodal cortex in perisylvian region = left dominant hemisphere Wernicke’s area = BA 22 Supramarginal gyrus = BA 40 Broca’s area = BA 44, 45 Phoneme = smallest discrete units of language Meaning Pattern of neural activity distributed across association cortices Broca’s aphasia Oral motor representation of phonemes damaged 2. Praxis distributed representations Knowledge of objects as tools Ventral visual association cortex = “what” system 3. Constructional apraxia Lost ability to draw and construct Lost all-at-once parallel processing Left hemisphere = sequential processes Language Praxis Right hemisphere = simultaneous, all-at-once analysis Chapter 12-4 1. Role of limbic system Subjective properties and assignment of value 2. Limbic system and the fight/flight response Limbic endows sense of extreme urgency = fight or flight 3. Major structures of limbic system Hypothalamus = principal effector organ Linked to ANS Para from hypothalamus = dorsal efferent nucleus of Vagus and sacral spinal cord Para neurons then project to viscera Afferents project to limbic via nucleus of solitary tract Cingulate gyrus Temporal poles Insula 4. Drives related to hypothalamic function Hunger – thirst – sexual drive 5. Lesions of amygdala and lateral septal nuclei Amygdala Contain complex emotions Damage = revert to elementary needs (hunger and sexual drive) Unusually placid Lateral septal nuclei Limit feelings to normality Damge = unsupressed rage and viciousness due to amplified emotions 6. James theory of definition of limbic values Visceral afferents monitor autonomic outflow resulting from emotional stimuli Chapter 12-5 1. Lesion Location Positives / NegativesLesion LocalizationCortical LesionLeft half of face and body Right CortexRight half of face and bodyLeft Cortex Aphasia (Language is usually on left hemisphere) Left CortexGraphesthesia or Stereoagnosia Left CortexWeakness (Weakness w/o CN symptoms = cortical lesion) Upper motor neuronParalysis Lower motor neuronFace more involved than leg ACA infarctLeg more involved MCA infarctHemispatial neglect of left side Eyes deviate to right side (Deviate to hemisphere involved) Right CortexEyes deviate to left side (Deviate to hemisphere involved) Left CortexNote: Eye deviation and visual field deficits also occur with subcortical lesions. Differential is hemispatial neglect. Subcortical Lesion (Basal ganglia, internal capsule, and thalamus) Face, arm, and leg involved on one sideInternal capsule Eye deviation or Visual field deficitsVisual pathway (due to lesion near internal capsule) Brainstem LesionCrossed motor/sensory from body with CN signs (Right CN III sign & Left motor deficits of body) Incoordination Ataxia Cerebellum (Cerebellar signs = same side lesion)Abnormal nystagmus PPRF or Vestibular nucleusPain / Temperature IPSI = Face CONTRA = body (Crossed CN signs with body motor/sensory) VTTT (Entirely form above CN V)Internuclear Ophthalmoplegia (INO) CN II or CN IIIEyes convergeDisconnection of MLF between the two nuclei (CN II and CN III intact) IPSI of lesion symptom CN nerve or nuclear lesionNote: Corticobulbar is bilateral to all CN motor except CN VII (lower face) and CN XII. Spinal cord Face usually NOT involved No language or CN deficits Paralysis immediately after lesion (Spinal shock) Hyperreflexia after spinal shock Discrete dermatomal loss of motor function Paralysis on side of lesion (IPSI) Pain and temperature loss CONTRA to loss of touch and proprioception (Unless ventral white commissure or both spinothalamic system affected) Discrete sensory level loss (Except when dorsal columns unaffected) Loss of pain and temperatureLesion at two dermatomal levels higher (Due to pain fibers running in Lissaeur’s tract before synapsing) Peripheral Nerve LesionEntire nerve function loss Note: Can be seen with CNS lesion, but usually with other deficits (motor/sensory function)  Hoang  PAGE 49 '(OR€Œ›s€ 3.:;_ž  (” ”įń:2 > ? • f#r#s#—#.$A$č$%}%£%!'?'·(ģ(Š)Ü)*¢+Č+--T-Ø/0Z1Œ1{2°2ü23 3H3µ4ū4ü4ž4ż÷ōōīōōīōōōōīōėōīōėęąęėęąęėęąęŚęŌęėęąęėęĢęĢęĢęĢęĢęĢęėĢęąęėĢęąęąęąęėōīōīÅī 6CJH*]6CJ]aJ 6CJaJ 5CJaJ 6CJaJCJaJCJ 6CJ]CJ 5CJ\CJN'(OPbŒŸ³ÄÓŚźł%5?EKTh²ß 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