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sympathetic nervous system

n.

The part of the autonomic nervous system originating in the thoracic and lumbar regions of the spinal cord that in general inhibits or opposes the physiological effects of the parasympathetic nervous system, as in tending to reduce digestive secretions or speed up the heart.

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Words nearby sympathetic nervous system

sympathetic imbalance, sympathetic ink, sympathetic introspection, sympathetic magic, sympathetic nerve, sympathetic nervous system, sympathetic ophthalmia, sympathetic strike, sympathetic string, sympathetic trunk, sympathetic uveitis
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for sympathetic nervous system

sympathetic nervous system
[ sĭm′pə-thĕt′ĭk ]

The part of the autonomic nervous system that tends to act in opposition to the parasympathetic nervous system, as by speeding up the heartbeat and causing contraction of the blood vessels. It regulates the function of the sweat glands and stimulates the secretion of glucose in the liver. The sympathetic nervous system is activated especially under conditions of stress. Compare parasympathetic nervous system.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.