b fiber

Medical Dictionary

B fiber n.
Any of the myelinated nerve fibers in autonomic nerves, having a diameter of 2 microns or less, conducting nerve impulses at a rate of 3 to 15 meters per second.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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