L13_NPB_101

L13_NPB_101 - Lecture13 OnlineHandouts: Lec13Notes Review...

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Unformatted text preview: Lecture13 OnlineHandouts: Lec13Notes Review VisualSystem AutonomicNervous System Announcements: Studentsrequiring extended;mefortes;ng mustgetCAFsignedSDC formsbyMonday. MotorControlI Organiza;on Reflex SpinalControl Reading(Recommended): Ch5(pg.171175) Ch7(pg.279285) REV:AutonomicNervousSystem ExtendsfromCNStoaninnervatedorgan Twoneuronchain Preganglionicfiber Postganglionicfiber Twosubdivisions Sympathe;cnervoussystem(SNS) Parasympathe;cnervoussystem(PNS) MostvisceralorgansinnervatedbybothSNS&PNS fibers Generallyproduceoppositeeffectsinapar;cularorgan Dualinnerva;onSNS&PNSallowsprecisecontrol REV:EffectsofANSonVariousOrgans MotorSystemI Organiza;on&SpinalReflex PNSSoma;cNervousSystem Consistsofaxonsofmotorneuronsthatoriginate inspinalcordorbrainstemandterminateon skeletalmuscle Motorneuronreleasesneurotransmi^er,Ach, whichs;mulatesmusclecontrac;on Motorneuronsarefinalcommonpathwayby whichvariousregionsofCNSexertcontrolover skeletalmuscleac;vity TheseareasofCNSincludespinalcord,motorregions ofcortex,basalnuclei,cerebellum,andbrainstem MotorSystem Organiza;on Afferent Sensory (Receptor) P N S Sensoryinput Primarysensoryareas (somatosensory,1ovisual, 1oauditorycor7ces) Highersensoryareas Associa7onareas Integra;on CNS Highermotorareas P N S Motor (Muscle) Primarymotorareas Efferent Motoroutput Fig.513,pg.149 LevelsofOrganiza;on MotorOutputcanbe: Voluntary(walking,standing,talking,etc) Involuntary(heartbeat,breathing,etc)[ANS] Wewillfocusonvoluntary Motorresponsesrangefrom: SIMPLE Reflex(automa;c,involuntaryandspinalcontrol) COMPLEX Voluntarymovement Reflex Astereotypedresponsetoafixeds;mulus 5typicalelements STIMULUS Sensor Afferent Path Integra7on Efferent Path Effector RESPONSE BasicReflexAnatomy 1 Sensor 2 Afferent Path 3 Integra7on 4 Efferent Path 5 Effector Receptors Receptors MuscleSpindle(length) GolgiTendonOrgan(tension/force) JointReceptor(posi;on) Musclefibertypes Extrafusal(force) Intrafusal(sensory) GolgiTendon Organ MuscleBody &Muscle Spindle Tendon Whole Muscle MuscleSpindleStructure Consistofcollec;onsofspecializedmuscle fibersknownasintrafusalfibers Liewithinspindleshapedconnec;ve;ssue capsulesparalleltoextrafusalfibers Eachspindlehasitsownprivateefferentand afferentnervesupply Playkeyroleinstretchreflex MuscleSpindle Capsule Alpha motor neuron axon Intrafusal (spindle) muscle fibers Gamma motor neuron axon Contractile end portions of intrafusal fiber Noncontractile central portion of intrafusal fiber Secondary (flower-spray) endings of afferent fibers Extrafusal ("ordinary") muscle fibers Primary (annulospiral) endings of afferent fibers Fig.824,pg.283 MuscleSpindleFunc;on Fig.825a,pg.284 StretchReflex(monosynap;c) Primarypurposeistoresisttendencyfor passivestretchofextensormusclesby gravita;onalforceswhenpersonisstanding upright Classicexampleispatellartendon,orknee jerkreflex PatellarTendon(Stretch)Reflex Fig.826,pg.285 MuscleSpindleSensi;vity Fig.825bcd,pg.284 InverseStretchReflex(polysynap;c) GolgiTendon Organ WithdrawalReflex(polysynap;c) Fig.531,pg.174 ReciprocalorAntagonis7cInhibi7on (Musclesgroupedinantagonis7cpairs) CrossExtensor&WithdrawalReflexes Fig.532,pg.175 ...
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This note was uploaded on 04/17/2008 for the course NPB 101 taught by Professor Fuller,charles/goldberg,jack during the Spring '08 term at UC Davis.

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