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sympathetic nervous system

A Dictionary of Psychology

sympathetic nervous system n. One of the two major subdivisions of the autonomic nervous system, consisting of nerves originating from the cervical, thoracic, and lumbar regions of the spinal cord, supplying muscles and glands, concerned with general activation and mobilizing the body's fight or flight reaction to stress or perceived danger. It acts in opposition to and more diffusely than the parasympathetic nervous system, accelerating pulse rate, dilating the pupils of the eyes and preparing them for far vision, causing the sweat glands to secrete and urine to be retained, inhibiting the smooth muscles of the alimentary canal, diverting blood from the skin and intestines to the voluntary striped muscles, and activating the adrenal gland to secrete adrenalin (epinephrine) and noradrenalin (norepinephrine). See also sympathetic ganglionic chain. SNS abbrev.[From Greek syn with + pathos suffering]

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© A Dictionary of Psychology 2001, originally published by Oxford University Press 2001.

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