7. Nervous tissue physiology- my flip version.pptx - The...

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The Nervous System-Nervous TissueChapter 11The Nervous System-Nervous TissueChapter 11Neurology-Study of normalfunctioning and disordersassociated with the nervoussystem
The Nervous system has threemajor functions:Sensory– monitors internal & externalenvironment through presence ofreceptorsIntegration– interpretation of sensory information(information processing); complex (higher order)functionsMotor– response to information processedthrough stimulation ofeffectorsmuscle contractionglandular secretion
Two Anatomical Division of Nervous TissueCentral nervous system (CNS)BrainSpinal cordPeripheral nervous system (PNS)All the neural tissue outsideCNSAfferentdivision (sensoryinput)Efferentdivision (motoroutput)Somatic nervous system(SNS)Autonomic nervoussystem (ANS)Enteric nervous system(ENS)
Chart to show that Breakdown
Peripheral Nervous system-SNSSNS- Soma=bodySomatic Sensory receptors that send messages toCNS (ex. In skin, special senses)Motor neurons sending impulse from CNS toskeletal muscles only!Voluntary part of PNS
Peripheral Nervous System-ANSVisceral receptors to the CNSMotor neurons that conduct impulses from CNS tosmooth/ cardiac muscle and glandsMotor division has two branchesSympathetic divisionParasympathetic division
Peripheral Nervous System-ANS DivisionsSympathetic DivisionHelps support emergencyactionFight or flightSpeeds up heart rate.Parasympathetic DivisionTakes care of rest anddigest activitiesSlows down heart rateIn general effectors havenerves from both divisionsbut each nerve has anopposing effect on theeffector
Peripheral Nervous SystemENSOver 100 million neurons that make upthe GI tract (enteric plexuses)Many of these nerves functionindependently of the ANS so it is nolonger apart of this division.This division is involuntaryFx- propel food, GI secretions andproducing GI hormonesCommunicates with the CNS but canfunction without it to an extent.
Histology of neural tissueTwo types of neural cells in the nervous system:Neurons- For processing,transfer, andstorage of informationNeuroglia– For support, regulation &protection of neurons
Structural Classification ofNeurons1. Multipolar- severaldendrites and oneaxon2. Bipolar- onedendrite and oneaxon3. Unipolar – oneprocess that exitscell body but splitsinto axon addendrite.
Parts of a NeuronKnow what these look like, where they areand what they do.1.Dendrites2.Cell body3.Axon4.Nissl bodies-free ribosomes andRough ER5.Nucleus6.Nucleolus7.Mitochondria8.Axon hillock9.Axon collateral10.Node of Ranvier11.Myelin Sheath-Know neuroglia of CNSand PNS that produce it12.Neurilemma (Neurolemma)13.

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