ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  ANS - the part of the nervous system of vertebrates that controls involuntary actions of the smooth muscles and heart and glandsautonomic ganglion - any of the ganglia of the autonomic system whose unmyelinated fibers innervate the internal organs nervous system, systema nervosum - the sensory and control apparatus consisting of a network of nerve cells neural structure - a structure that is part of the nervous system 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 parasympathetic, parasympathetic nervous system - 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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