Autonomic Nervous System

Autonomic Nervous System (ANS) is involuntary in nature and activities of this system are maintained autonomically.

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Divisions

ANS is divided into 3 main divisions
  • Sympathetic
  • Parasympathetic and
  • Enteric nervous sytem

Division of ANS into sympathetic and parasympathetic is anatomical in origin. Fibres of sympathetic system originate from thoracic and lumbar spinal cord (thoracolumbar outflow) whereas fibres of parasympathetic system originate from cranial nerves (III,VII,IX and X) and sacral (S 2, 3, 4) spinal cord (craniosacral outflow).



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