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Neuroanatomy Flashcards

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13542502746unipolar0
13542502747bipolar1
13542511976multipolar2
13542541709sensory neuronsdetect changes in environment and transmit information to CNS; afferent info to the CNS; unipolar3
13542556105motor neuronssend signals to target tissue in order to elicit a response to a particular stimulus; efferent information- away from the CNS; multipolar4
13542568287interneuronsserve an integrative function- interconnect incoming sensory and outputing motor information; bipolar5
13542601705Principle of Dynamic Polarizationelectrical signals within a neuron flow only in one direction6
13542611018Principle of Connectional Specificityneurons separated by synapse, neurons communicate with specific other neurons in organized networks- not randomly7
13542629236action potentialsbrief change from negative to positive in transmembrane potential; all or none response: amplitude of AP does not change based on magnitude of stimulus8
13542786519depolarizationmembrane potential more positive than resting potential9
13542789214repolarizationreturn of membrane potential to resting value10
13542791834hyperpolarizationmembrane potential more negative than resting potential11
13542796710thresholdthe potential to which a membrane must be depolarized to initiate an action potential12
13542807638spatial summation1. simultaneous stimulation by several presynaptic neurons 2. EPSPs spread from several synapses to axon hillock 3. postsynaptic neuron fires13
13542820226temporal summation1. high frequency stimulation by one presynaptic neuron 2. EPSPs spread from one synapse to axon hillock 3. postsynaptic neuron fires14
13542832187CNSbrain and spinal cord15
13542834489PNSnerves and ganglia outside brain and spinal cord16
13542841358forebrain, midbrain, hindbrain3 major divisions of the brain17
13542849939telencephalon and diencephalon2 parts of the forebrain18
13542858432cerebral cortex, basal ganglia, limbic system3 parts of the telencephalon19
13542861218thalamus and hypothalamus2 parts of the diencephalon20
13542865465tectum and tegmentum2 parts of the mesencephalon21
13542871916metencephalon and myelcephalon2 parts of the hindbrain22
13542874668cerebellum and pons2 parts of the metencephalon23
13542879150medulla oblongataone part of the myelcephalon24
13543128102exteroceptioninformation about the state of the environment; external to body25
13543134076proprioceptioninformation about the state of the body; body position26
13543138917vestibularmotion, equilibrium27
13543143430photoreceptorslight28
13543146304mechanoreceptorsphysical deformation29
13543150084auditorysound30
13543150085nocioceptorspain31
13543152186Thermoreceptorstemperature32
13543162574merkel discs, ruffini endings, meissner corpuscles, pacinian corpuscles4 mechanoreceptors of the skin33
13543162575merkel discsform and text (light touch, 2 point discrimination)34
13543169459ruffini endingspressure, cutaneous stretch35
13543173156meissner corpuscleslow frequency vibration, motion of stimuli (slip, grip control)36
13543180774pacinian corpusclesdeep pressure, high frequency vibration37
13543185645muscle spindleslocated in muscle bellies, detect change in muscle length38
13543191841golgi tendon organslocated at muscle-tendon junction, changes in muscle tension: passive stretch, active contraction39
13543199025joint receptorsprovide information about joint position, ROM; stretch at end ranges; joint ROM, movement40
13543219957dorsal column-medial lemniscal tractleads to conscious awareness of sensation: discriminate touch, pressure, vibration, joint position; fast, direct, brings info to brain without an interviewing synapse41
13573448644DCML Tract Pathwayfirst order: sensory receptor dorsal root ganglion to dorsal column, ascends to medulla and synapse second order: crosses over in medulla, ascends to the thalamus third order: thalamus to primary somatosensory42
13573462946anterolateral-spinothalamic tractleads to conscious awareness of sensation: pain, temperature, crude touch, firm pressure, some proprioceptive information; slow conduction43
13573482438ALST tract pathwayfirst order: dorsal root ganglion, synapses at the level second order: crosses over at every level of spinal cord then ascends to medulla third order: to primary somatosensory cortex44
13573571210spinocerebellar tractleads to unconscious proprioception and kinesthesia from muscles and lower body surface, some pain and pressure, fast conduction45
13573583520spinocerebellar tract pathwayfirst order: afferent signal from muscle spindles, GTP second order: terminates in cerebellum for unconscious control of posture and coordination46
13573602441pupilopening through which light enters the eye47
13573604766cornea and lensrefracts and focuses light on the retina48
13573606677retinalight sensitive tissue in the back of the eye49
13573609061foveasmall center portion of retina where detailed vision occurs50
13573611419optic diskarea of retina where all nerve fibers exit the eye towards the CNS51
13573615133photoreceptorsrespond to light52
13573615134rodsphotoreceptor, movement and contrast53
13573618703conesphotoreceptors, color and fine features54
13573625973visual information to primary visual cortexvisual field > L & R eye > retina > optic nerve > optic chiasm > optic tract > thalamus (LGN) > optic radiations > primary visual cortex55
13573644751semicircular canals, utricle, saccule3 parts of the vestibular apparatus56
13573647980semicircular canalsangular head movements57
13573651848utriclehorizontal acceleration58
13573651849sacculevertical acceleration59
13573657172vestibular systemperception of self-motion, perception of head position, spatial orientation, afferent info is used to stabilize gaze, head and posture60
13573671247spinal cord, extra-ocular motor nuclei, cerebellum, thalamus, sensory cortexpathways from the vestibular system61
13573676970relays sensory info, directs info, encodes info3 important functions of the thalamus for perception62
13573691614sensory relay nucleiinput DCML to VPL ALST to VPL, VI VN to VPM63
13573696842ventral thalamus nucleiproject sensory information to the primary sensory cortex64
13573698768lateral geniculate nucleusprojects visual information to primary visual cortex65
13574758348DCML and ALST tractinput for the somatosensory information66
13574760664somatosensory cortexoutput for the somatosensory information67
13574766166optic tractinput for visual information68
13574769733primary visual cortexoutput for visual information69
13574771758sensationneural activity triggered by a stimulus that activates a sensory receptor and results in sensory nerve impulses traveling the sensory nerve pathways to the brain, just an electrical impulse70
13574773361perceptionmultistage process that takes places in the brain and includes selecting, processing, organizing, and integrating information received from the senses. Process whereby meaning is attached to sensory stimuli; happens in multiple areas71
13574806102primary somatic sensory cortex, unimodal association cortex, multimodal association cortexsensory hierarchy72
13574816631prefrontal cortex, premotor cortex, primary motor cortexmotor hierarchy73
13574824555primary somatosensory cortexmajor processing area for all somatosensory modalities, basic information form specific senses, receives info from the thalamus74
13574824556unimodal association cortexdecode, re-encode, simple stimulus reorganized into potentially meaningful, recognizable chunks75
13574832889multimodal association cortexvisual, auditory, somatosensory information converges and integrates here; encoding for perception; understanding of where your body is within the environment76
13574868364primary motor cortex and USAC2 outputs for primary somatosensory cortex77
13574884754MMAC and premotor cortex2 outputs for unimodal sensory association cortex78
13574893308prefrontal cortexoutput for MMAC79
13574931824primary motoractivates around 50 ms before movement, relay motor commands via upper motor neurons descending to the medulla, encode for movements, not single muscles (force, direction, speed)80
13574949213primary somatosensory cortexinput for the primary motor cortex81
13575005164supplemental motor areacontrols internally initiated movements, re-encodes kinematic to dynamic information; motor planning, force coding, learning82
13575015890prefrontal cortexinput for supplemental motor area83
13575026914premotor cortex, primary motor cortexoutput for supplemental motor area84
13575031246UMACinput for premotor cortex85
13575034146primary motor cortexoutput for premotor cortex86
13575037596premotor corteximportant in planning and preparation of movements, associates external sensory stimuli to motor response87
13575062053prefrontal cortexselection of appropriate actions for a particular behavioral context, executive function, planning action strategy, selection of motor response based on behavioral cortex88
13575069791posterior parietal cortexinput for prefrontal cortex89
13575075450SMA and premotor cortexoutput for prefrontal cortex90
13575090592primary somatosensory cortex and motor cortexsimple finger flexion with right index finger91
13575092086SMAthinking about the movement92
13575098159prefrontal cortex, primary somatosensory cortex, motor cortex, premotor cortexcomplex sequence of movements93
13575122588anterior, posterior, flocculonodular3 lobes of the cerebellum94
13575133213vestibulocerebellum, spinocerebellum, cerebrocerebellum3 functions of the cerebellum95
13575142171visual cortex, vestibular nuclei, semicircular canals3 inputs for the vestibulocerebellum96
13575152093vestibular nuclei to head and eye musculature and postural musclesoutput for vestibulocerebellum97
13575162757vestibular reflexes, regulation and maintenance of balance, posture, visual tracking3 functions of the vestibulocerebellum98
13575191526vermis and intermediate hemispheres2 parts of the spinocerebellum99
13575213316spinocerebellar tract, visual vestibular, auditory3 inputs for the spinocerebellum100
13575228111fastigial nuclei to thalamus to motor cortex, interposed nuclei to lateral descending pathway2 outputs for the spinocerebellum101
13575239850sensory map of joint/limb position, correct deviations from motor plan, feed forward mechanisms, modulate muscle tone4 functions of the spinocerebellum102
13575245461cerebral cortexinput for the cerebrocerebellum103
13575248663thalamus to primary motor, premotor, prefrontal cortexoutput for the cerebrocerebellum104
13575260961correct deviations from intended movements, motor planning and timing, motor learning3 functions of the cerebrocerebellum105
13575266185automatic control of movement, error detection, modification of motor sequence in response to error, motor learning4 overall functions of the cerebellum106
13575308673movement initiation and completion, activates and retrieves movement plans, scales movement parameters, adds sequencing information4 overall functions of the basal ganglia107
13575318381striatum, globus pallidus, subthalamic nucleus, substantia nigra4 functional divisions of the basal ganglia108
13575335040globus pallidus, substantia nigra2 outputs for the striatum109
13575346199striatum, subthalamic nucleus2 inputs for the globus pallidus110
13575352228thalamus, prefrontal, SMA, premotor cortex4 outputs for the globus pallidus111
13575355660striatuminput and output for the subthalamic nucleus112
13575358425globus pallidusinput and output for substantia nigra113
13575371927primary somatosensory and primary motor cortex2 inputs to the putamen (motor functions)114
13575376943prefrontal cortex and PPC2 inputs to the caudate nucleus (movement planning)115
13575397855corticospinal, corticobulbar, rubrospinal3 lateral descending tracts116
13575403246corticospinal and corticobulbarboth apart of the pyramidal tract117
13575408612corticospinal tractfrom motor cortex, 90% precise movements118
13575410897corticobulbar tractfrom motor cortex, on to muscle of face and neck119
13575414441pyramidal tractupper motor neurons cross over in pyramids of medulla, descend in spinal cord to level of the appropriate spinal nerve root, lower motor neurons innervate a fiber of skeletal muscle; responsible for voluntary movements, fine motor movements, fast conduction speed120
13575448304extrapyramidal tractfrom interposed nuclei to red nuclei then descends; involuntary and automatic control of all musculature: muscles tone, balance, posture, locomotion; integrates sensory information for posture and balance121

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