pertaining to nerve fibers that are not covered with a myelin sheath.
Origin of unmyelinated
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Lacking a myelin sheath. Used of a nerve fiber.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.