C fibers

C fibers
unmyelinated nerve fibers, having a smaller diameter (0.3 to 1.3 μm) and a slower conduction velocity (0.6 to 2.3 meters per second) than alpha fibers. They are found as postganglionic (efferent) fibers of the autonomic nervous system, and as afferent fibers at posterior roots, receiving impulses from free nerve endings that act as thermoreceptors, nociceptors, and interoceptors.

Medical dictionary. 2011.

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