| Definition of 'parasympathetic nervous system' |
Princeton's WordNet |
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1. (noun) parasympathetic nervous system, parasympathetic
originates in the brain stem and lower part of the spinal cord; opposes physiological effects of the sympathetic nervous system: stimulates digestive secretions; slows the heart; constricts the pupils; dilates blood vessels
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| Definition of 'parasympathetic nervous system' |
U.S. National Library of Medicine |
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1. parasympathetic nervous system
The craniosacral division of the autonomic nervous system. The cell bodies of the parasympathetic preganglionic fibers are in brain stem nuclei and in the sacral spinal cord. They synapse in cranial autonomic ganglia or in terminal ganglia near target organs. The parasympathetic nervous system generally acts to conserve resources and restore homeostasis, often with effects reciprocal to the sympathetic nervous system.
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Definitions of parasympathetic nervous system 
