Module 06 Nervous System.pdf - Nervous Tissue Anatomy and...

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Nervous TissueAnatomy and Physiology I
ObjectivesIdentify the components to the nervous systemDefine the terms afferent and efferentCompare and contrast the CNS and PNSDescribe the functions of the nervous systemCompare and contrast the function of the neurogliaIdentify and describe the function of the anatomical components to a neuronCompare and contrast grey and white matterLabel neurons accordingly to their function and structure5/15/20202
Nervous System:OverviewNervous system influences and/or controls every thought, action and emotionComposed of nerves which are NEURON cellsNeurons communicate with other neurons and different part of the body viaelectrical and chemical signalsThe signals are rapid and cause immediate responsesNervous system is divided into 2 divisions:Central nervous systemPeripheral nervous system5/15/20203
Nervous System:DivisionsCentral Nervous System (CNS)Brain and spinal cordIntegration centerPeripheral Nervous System (PNS)Autonomic nervous system is further divided intoParasympathetic nervous systemSympathetic nervous systemAfferent (sensory) divisionEfferent (motor) division4
Components of the nervous system.
Functional Divisions of the Nervous System5/15/20207Sensory functionsSensory inputAfferent division of PNSIntegration/ ProcessingNeural integrationCNS acts as the controlcenterResponding (Output)Motor outputEfferent division of PNSThese 3 Basic functions overlap:Normal and abnormal function of the nervous system corresponds to these threefunctions
5/15/20208
Cells in theNervous system1.Neurons(aka nerve cells)2.NeurogliacellNeuroglia cells protect, support andassist the function of neuron cellsThere are 6 different types ofneuroglia cells. (4 in CNS; 2 in PNS)Outnumber neurons 10:19
Neuroglia cells1.Astrocytes:Support/brace neurons and connect themto capillaries to gain nutrients2.Microglial cells:Act as animmune celland assistdamaged/dying neurons3.Ependymal cells:Help form theblood-brain barrier4.Oligodendrocytes:Formmyelin(fatty) sheaths around theaxons of neurons in CNS10
Nerve Tissue:PNSNeuroglia cells5.Satellite cellsSurround cell body of neuronAssist with connecting PNSneurons to capillaries to gainnutrients6.Schwann cellsForm myelin sheaths aroundaxons in the PNSSimilar in function to theoligodendrocytes5/15/202011
NeuronsMain cell of the nervous systemIt is the functional and structural unitof the nervous systemConduct nerve impulses (akaactionpotentials) from area of the body toanotherFound in the CNS and PNSSurrounding neurons are theneuroglia cells (glia cells)12
Nerve Tissue:NeuronAlthough Neurons are long and have aunique shapeThey consist of a plasma membrane,cytoplasm, organelles and a nucleus

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Term
Spring
Professor
Garrity
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