Definition: The nervous system is composed of three parts: the central nervous system, the autonomic nervous system, and the peripheral nervous system. The brain and spinal cord form the central nervous system. The autonomic nervous system controls core functions like heart rate and breathing. And the peripheral nervous system regulates movement and sensation.
The Nervous System
From Jeri Jewett-Tennant, MPH, for About.com
Updated: February 12, 2008
About.com Health's Disease and Condition content is reviewed by our Medical Review Board
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