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Any of the nerve fibers that lack a fatty myelin sheath but like other nerve fibers are enveloped by a sheath of Schwann cells.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
A nerve fiber that lacks a myelin sheath, although a neurilemma may be present in the peripheral nervous system.
See also: fiber
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