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What (who) is sympathetic nerve - definition
![Scheme showing structure of a typical [[spinal nerve]]. 1. Somatic efferent. 2. Somatic afferent. 3,4,5. Sympathetic efferent. 6,7. Sympathetic afferent.](https://commons.wikimedia.org/wiki/Special:FilePath/Gray799.svg?width=200 "Scheme showing structure of a typical [[spinal nerve]]. 1. Somatic efferent. 2. Somatic afferent. 3,4,5. Sympathetic efferent. 6,7. Sympathetic afferent.")
![The sympathetic nervous system extends from the thoracic to lumbar [[vertebra]]e and has connections with the thoracic, abdominal, and pelvic plexuses.](https://commons.wikimedia.org/wiki/Special:FilePath/Gray838.png?width=200 "The sympathetic nervous system extends from the thoracic to lumbar [[vertebra]]e and has connections with the thoracic, abdominal, and pelvic plexuses.")
Wikipedia
The sympathetic nervous system (SNS) is one of the three divisions of the autonomic nervous system, the others being the parasympathetic nervous system and the enteric nervous system. The enteric nervous system is sometimes considered part of the autonomic nervous system, and sometimes considered an independent system.
The autonomic nervous system functions to regulate the body's unconscious actions. The sympathetic nervous system's primary process is to stimulate the body's fight or flight response. It is, however, constantly active at a basic level to maintain homeostasis. The sympathetic nervous system is described as being antagonistic to the parasympathetic nervous system. The latter stimulates the body to "feed and breed" and to (then) "rest-and-digest".
