involuntary nervous system

involuntary nervous system
autonomic nervous s.

Medical dictionary. 2011.

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  • sympathetic nervous system — noun originates in the thoracic regions of the spinal cord; opposes physiological effects of the parasympathetic: reduces digestive secretions; speeds the heart; contracts blood vessels • Hypernyms: ↑nervous system, ↑systema nervosum • Part… …   Useful english dictionary

  • Autonomic nervous system — The autonomic nervous system Blue = parasympathetic Red = sympathetic Latin divisio autonomica systematis nervosi peripherici The autonomic nervous system (ANS or visceral nervous syste …   Wikipedia

  • Autonomic nervous system — Part of the nervous system that was once thought to be functionally independent of the brain. The autonomic nervous system regulates key functions of the body including the activity of the heart muscle (see below), the smooth muscles (e.g., the… …   Medical dictionary

  • Sympathetic nervous system — A part of the nervous system that serves to accelerate the heart rate, constrict blood vessels, and raise blood pressure. The sympathetic nervous system and the parasympathetic nervous system constitute the autonomic nervous system, the branch of …   Medical dictionary

  • autonomic nervous system — the system of nerves and ganglia that innervates the blood vessels, heart, smooth muscles, viscera, and glands and controls their involuntary functions, consisting of sympathetic and parasympathetic portions. [1895 1900] * * * Part of the nervous …   Universalium

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