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Group B nerve fibers are one of the three classes of nerve fiber as generally classified by Erlanger and Gasser. They are moderately myelinated, which means less myelinated than group A nerve fibers, and more myelinated than group C nerve fibers. 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.

References

1. Guyton, Arthur C.; Hall, John Edward (2006). Textbook of Medical Physiology. Elsevier Saunders. ISBN 978-0-7216-0240-0.
2. "Classification of Nerve Fibers". pharmacy180.com. Retrieved 2023-09-06.

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