| Definition of 'sympathetic nervous system' |
Princeton's WordNet |
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1. (noun) sympathetic nervous system
originates in the thoracic regions of the spinal cord; opposes physiological effects of the parasympathetic: reduces digestive secretions; speeds the heart; contracts blood vessels
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| Definition of 'sympathetic nervous system' |
U.S. National Library of Medicine |
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1. sympathetic nervous system
The thoracolumbar division of the autonomic nervous system. Sympathetic preganglionic fibers originate in neurons of the intermediolateral column of the spinal cord and project to the paravertebral and prevertebral ganglia, which in turn project to target organs. The sympathetic nervous system mediates the body's response to stressful situations, i.e., the fight or flight reactions. It often acts reciprocally to the parasympathetic system.
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Definitions of sympathetic nervous system 
