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Neuroanatomy, Sympathetic Nervous System.


Alshak MN1, M Das J2.


StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2020-.
2019 May 13.

Author information

Weill Cornell Medicine
National Hospital for Neurology and Neurosurgery, Queen Square, London


The sympathetic nervous system (SNS) is one of the two divisions of the autonomic nervous system (ANS), the other being the parasympathetic nervous system (PNS), These systems largely work unconsciously in opposite ways to regulate many functions and parts of the body. Colloquially, the SNS governs the "fight or flight" response while the PNS controls the "rest and digest" response. The main overall end effect of the SNS is to prepare the body for physical activity, a whole-body response affecting many organ systems throughout the body to redirect oxygen-rich blood to areas of the body needed during intense physical demand.[1]

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