Canadian Medical Guide > Anatomy > Nervous System > Neurons > Nerve Fibers > Nerve Fibers, Myelinated Terms and Definitions

Nerve Fibers, Myelinated

Medical Definition:	A class of nerve fibers as defined by their structure, specifically the nerve sheath arrangement. The AXONS of the myelinated nerve fibers are completely encased in a MYELIN SHEATH. They are fibers of relatively large and varied diameters. Their NEURAL CONDUCTION rates are faster than those of the unmyelinated nerve fibers (NERVE FIBERS, UNMYELINATED). Myelinated nerve fibers are present in somatic and autonomic nerves.
Also Called:	A Fibers,B Fibers
Previously Indexed:	Neurons (1966-1971)

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