What is B FIBER?

Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

refers to a myelinated nerve fiber of the autonomic nervous system that transmits nerve impulses to a sympathetic chain. B fibers are approximately 2mm or less in diameter and carry impulses at speeds of 3-15 m/s. Compare with A fiber- C fiber.

B FIBER: "A B fiber transmits impulses from the autonomic nervous system to the sympathetic chain."

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