Nervous System Terminology

Nervous System Terminology - • Vesicles are fluid-filled...

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Nervous System Terminology The following terms are commonly used in descriptions of nervous system features:  •   A nerve fiber is an axon or dendrite. A nerve is a bundle of nerve fibers in the PNS. A nerve tract  is a bundle of nerve fibers in the CNS. •   White matter consists of myelinated axons of neurons in the CNS. •   Gray matter consists of unmyelinated portions of neurons (cell bodies, dendrites, and axon  terminals), unmyelinated neurons, and neuroglia in the CNS. •   Nuclei are clusters of cell bodies in the CNS. Ganglia are clusters of cell bodies in the PNS  (except the  basal ganglia,  which are more appropriately called basal nuclei). 
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Unformatted text preview: • Vesicles are fluid-filled cavities in the brain that form during early development. The tissues that form the vesicles divide to become the various components of the brain. • Ventricles are interconnected cavities in the mature brain that originate from the fluid-filled vesicles. Circulating fluid (cerebrospinal fluid—CSF) in the ventricles provides nourishment for nervous tissue and transports waste away from the nervous tissue. • Peduncles are large tracts that emerge from certain regions of the brain. Their large size gives the appearance of supporting the structure from which they emerge (peduncle means “little foot”)....
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This note was uploaded on 11/10/2011 for the course PT 101 taught by Professor Staff during the Spring '10 term at Texas State.

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