General somatic afferent fibers

The general somatic afferent fibers (GSA, or somatic sensory fibers) afferent fibers arise from neurons in sensory ganglia and are found in all the spinal nerves, except occasionally the first cervical, and conduct impulses of pain, touch and temperature from the surface of the body through the dorsal roots to the spinal cord and impulses of muscle sense, tendon sense and joint sense from the deeper structures.[1]

General somatic afferent fibers
Scheme showing structure of a typical spinal nerve.
1. Somatic efferent.
2. Somatic afferent.
3,4,5. Sympathetic efferent.
6,7. Sympathetic afferent.
Anatomical terminology

See also


This article incorporates text in the public domain from page 849 of the 20th edition of Gray's Anatomy (1918)

  1. Sikandar, Shafaq; Dickenson, Anthony H. "Visceral Pain – the Ins and Outs, the Ups and Downs". Current Opinion in Supportive and Palliative Care. 6 (1): 17–26. doi:10.1097/SPC.0b013e32834f6ec9. PMC 3272481.

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