unmyelinated

[uhn-mahy-uh-luh-ney-tid]
adjective Anatomy.
pertaining to nerve fibers that are not covered with a myelin sheath.

Origin:
1915–20; un-1 + myelinated

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American Heritage
Medical Dictionary

unmyelinated un·my·e·lin·at·ed (ŭn-mī'ə-lĭ-nā'tĭd)
adj.
Lacking a myelin sheath. Used of a nerve fiber.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
There's this constant limit, which is that the fibers are unmyelinated.
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