Group B nerve fiber
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Group B nerve fibers are one of the three classes of nerve fiber as generally classified by Erlanger and Gasser.[1] They are moderately myelinated, which means less myelinated than group A nerve fibers, and more myelinated than group C nerve fibers.[2] They have a medium conduction velocity of 3 to 14 m/s. They are usually general visceral afferent fibers and preganglionic nerve fibers of the autonomic nervous system. They are used in Bainbridge reflex as afferents.[citation needed]
