L 28 Sensory systems I

L 28 Sensory systems I - Sensory systems I Cellular...

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Sensory systems I Cellular components of the nervous system
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2 basic cell types neuron (transmits signals) glia (structural and functional support) 2 levels of organisation of these cells into: central nervous system (CNS) and peripheral nervous system (PNS) CNS = brain + spinal cord PNS = nerves of the body
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Structure of a neuron 4 parts : cell body or soma dendrites (receive) 1 axon (conducts) terminal arborisation, synapses
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Cell body – contains nucleus and metabolic machinery of cell, can be huge relative to other cells e.g. motor neuron. Cell body close to dendrites in motor neuron, not in bipolar retinal neuron or pseudounipolar sensory neuron
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Group of cell bodies outside the CNS = ganglion Only 1 axon, but can be thousands of dendrites, receive stimiuli, make synapses with an axon
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frequently branched. Conducts cellular flow to end (axoplasmic flow). Conducts action potential due to polarized membrane – 60mv +ve outside. Ion channels open, Na+ enter, depolarised (reversed)
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This note was uploaded on 08/28/2011 for the course ZOO 3713c taught by Professor Staff during the Spring '08 term at University of Florida.

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L 28 Sensory systems I - Sensory systems I Cellular...

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