Medical

B fiber

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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® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
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