bio 243 - ch.11

bio 243 - ch.11 - CLASSIFICATION OF NEURONS 3 structure...

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CLASSIFICATION OF NEURONS 3 structure types of neurons (based on # of extensions) Multipolar Bipolar Unipolar Functional Classification of Neurons : Afferent Neurons Association Neurons Efferent Neurons
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Type Structural Characteristics Location Bipolar Neuron cell body with a process (“nerve fiber”) arising from each end B specialized parts of the eyes, nose, and ears Unipolar Neuron cell body with a single process (“nerve fiber”) that divides into two branches U in ganglia outside the brain or spinal cord Multipolar neuron cell body with many nerve fibers , one of which is an axon M most common type of neur- on in the brain and spinal cord NEURONS CLASSIFIED BY FUNCTION Type Structural Characteristics Location Sensory Neuron “Afferent” (towards cns) carry impulses from peripheral part to brain or spinal cord S most unipolar some bipolar Interneuron (A.N.) “Association” sends nerve impulses between neurons only within the brain and spinal cord I multipolar Motor Neuron “Efferent” (from cns)
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This note was uploaded on 11/08/2011 for the course BIOL 243 taught by Professor Datt during the Spring '08 term at South Carolina.

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bio 243 - ch.11 - CLASSIFICATION OF NEURONS 3 structure...

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