sympathetic nervous system

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• Sympathetic nervous system — Infobox Anatomy Name = Sympathetic nervous system Caption = The sympathetic nervous system extends from the thoracic to lumbar vertebrae and has connections with the thoracic, abdominal, and pelvic plexuses. Mesh = Sympathetic+Nervous+SystemThe… …   Wikipedia

• nervous system — Anat., Zool. 1. the system of nerves and nerve centers in an animal or human, including the brain, spinal cord, nerves, and ganglia. 2. a particular part of this system. Cf. autonomic nervous system, central nervous system, peripheral nervous… …   Universalium

• Nervous system — Nervous Nerv ous (n[ e]rv [u^]s), a. [L. nervosus sinewy, vigorous: cf. F. nerveux. See {Nerve}.] 1. Possessing nerve; sinewy; strong; vigorous. Nervous arms. Pope. [1913 Webster] 2. Possessing or manifesting vigor of mind; characterized by… …   The Collaborative International Dictionary of English

• Sympathetic nervous system — A part of the nervous system that serves to accelerate the heart rate, constrict blood vessels, and raise blood pressure. The sympathetic nervous system and the parasympathetic nervous system constitute the autonomic nervous system, the branch of …   Medical dictionary

• sympathetic nervous system — One of the two divisions of the vertebrate autonomic nervous system (the other being the parasympathetic nervous system). The sympathetic preganglionic neurons have their cell bodies in the thoracic and lumbar regions of the spinal cord, and… …   Dictionary of molecular biology

• sympathetic nervous system — noun The part of the autonomic nervous system that under stress raises blood pressure and heart rate, constricts blood vessels and dilates the pupils. See Also: parasympathetic nervous system, sympathectomy …   Wiktionary

• System, sympathetic nervous — A part of nervous system that accelerates the heart rate, constricts blood vessels, and raises blood pressure. The sympathetic nervous system together with the parasympathetic nervous system (that slows the heart rate, increases intestinal and… …   Medical dictionary

• Parasympathetic nervous system — A part of nervous system that serves to slow the heart rate, increase the intestinal and gland activity, and relax the sphincter muscles. The parasympathetic nervous system, together with the sympathetic nervous system (that accelerates the heart …   Medical dictionary

• parasympathetic nervous system — noun Date: circa 1934 the part of the autonomic nervous system that contains chiefly cholinergic fibers, that tends to induce secretion, to increase the tone and contractility of smooth muscle, and to slow heart rate, and that consists of a… …   New Collegiate Dictionary

• stomodeal nervous system — see stomatogastric sympathetic nervous system …   Dictionary of invertebrate zoology