• noun
• synonym
• antonym

• autonomic nervous system (noun)
  1. the part of the nervous system of vertebrates that controls involuntary actions of the smooth muscles and heart and glands
• central nervous system (noun)
  1. the main part of your NERVOUS SYSTEM, consisting of your brain and your SPINAL CORD
• parasympathetic nervous system (noun)
  1. 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
• peripheral nervous system (noun)
  1. the section of the nervous system lying outside the brain and spinal cord
• sympathetic nervous system (noun)
  1. 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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