Chapter12NeuralTissueMarieb

Chapter12NeuralTissueMarieb - Chapter 12: Fundamentals of...

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Chapter 12: Fundamentals of the Nervous System and Nervous Tissue Overview of the NS PNS (Peripheral Nervous System) CNS (Central Nervous System) Neurons Neuroglia Synapse Some nomenclature Developed by John Gallagher, MS, DVM
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Functional Overview of NS CNS = Brain and Spinal Cord Integration, processing and coordination of sensory data and motor commands Higher functions PNS 1. Sensory or afferent division with sensory neurons. Brings sensory info from PNS to CNS. Begins at receptors 2. Motor or efferent division with motor neurons. Brings motor commands to peripheral tissue. Ends at effector cells.
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Made up of neurons and neuroglia
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Similar to fig 12.3
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Cellular Organization of Neural Tissue Two cell types: 1. Neurons 1. “Excitable” cells 2. Neuroglia (mostly not excitable) Schwann cells Satellite cells Astrocytes Oligodendrocytes Microglial cells Ependymal cells
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1. Typical Neuron Structure Cell body or Soma with Perikaryon Dendrites Axon with axon hillock Synaptic terminals Fig 12.4
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Cell body = Soma
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The “signal,” or Action Potential is carried along the neurilemma Faster if axon is myelinated
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Nerve structure Fig 12.16, p 333 •A nerve is USUALLY both sensory
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This note was uploaded on 12/16/2011 for the course BIOLOGY 101 taught by Professor Mr.wallace during the Fall '11 term at Montgomery College.

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Chapter12NeuralTissueMarieb - Chapter 12: Fundamentals of...

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