Bell-Magendie law


Bell-Magendie law
Bell-Ma·gen·die law 'bel-.mȧ-zhan-'dē- n BELL'S LAW
Bell Sir Charles (1774-1842)
British anatomist. Bell was the leading anatomist of his time as well as an eminent surgeon. In 1802 he published a series of engravings showing the anatomy of the brain and the nervous system. In 1811 he published one of the most seminal works in all of neurology, Idea of a New Anatomy of the Brain. In 1830, he produced an expanded work, The Nervous System of the Human Body. In these books he distinguished between sensory nerves and motor nerves and announced his finding that the anterior roots of the spinal nerves are motor in function, while the posterior roots are sensory. First presented in 1811, this statement is alternately known as Bell's law or as the Bell-Magendie law, due to the fact that François Magendie later elaborated on it. One of the classic descriptions in Bell's Nervous System of the Human Body is his detailed account of the facial nerve, which he had originally described in 1821. He also described the facial paralysis resulting from a lesion of this nerve. The paralysis is now known as Bell's palsy.
Ma·gen·die mȧ-zhan-dē François (1783-1855)
French physiologist. An experimental physiologist, Magendie is remembered for his pioneering investigations into the effects of drugs on various parts of the body. His researches led to the scientific application of such compounds as strychnine and morphine into medical practice. In 1821 he founded the first journal devoted to experimental physiology. The following year he confirmed and elaborated upon Bell's law. He was the first to actually prove the functional difference of the spinal nerves. Magendie was also one of the first to observe anaphylaxis, discovering in 1839 that rabbits tolerating a single injection of egg albumin often died following a second injection.

Medical dictionary. 2011.

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  • bell-magendie law — ˈbelˌmȧˌzhaⁿ ˈdē noun Usage: usually capitalized B&M Etymology: after Sir Charles Bell died 1842 Scottish anatomist & François Magendie died 1855 French physiologist : bell s law …   Useful english dictionary

  • Bell-Magendie law — noun see bell s law …   Useful english dictionary

  • Bell's law — belz n a statement in physiology: the roots of the spinal nerves coming from the ventral portion of the spinal cord are motor in function and those coming from the dorsal portion are sensory called also Bell Magendie law …   Medical dictionary

  • bell's law — ˈbelz noun Usage: usually capitalized B Etymology: after Sir Charles Bell died 1842 Scottish anatomist : a statement in physiology: the roots of the spinal nerves coming from the ventral portion of the spinal cord are motor in function and those… …   Useful english dictionary

  • law — 1. A principle or rule. 2. A statement of fact detailing a sequence or relation of phenomena that is invariable under given conditions. SEE ALSO: principle, rule, theorem. [A.S. lagu] Alexander l. states that a jerky nystagmus becomes worse when… …   Medical dictionary

  • Bell — John, Scottish surgeon and anatomist, 1763–1820. See B. muscle. Sir Charles, Scottish surgeon, anatomist, and physiologist, 1774–1842. See B. law, B. Magendie law, B. respiratory nerve, B. palsy, B. spasm, external respiratory nerve of B …   Medical dictionary

  • Magendie — François, French physiologist, 1783–1855. See foramen of M., Bell M. law, M. law, M. spaces, under space, M. Hertwig sign, M. Hertwig syndrome …   Medical dictionary

  • François Magendie — in 1822 Born 6 October 1783 …   Wikipedia

  • Charles Bell — For other people named Charles Bell, see Charles Bell (disambiguation). Charles Bell Sir Charles Bell Born …   Wikipedia

  • Foramen of Magendie — An opening from the fourth ventricle, which is one in a system of four communicating cavities called ventricles within the brain that are continuous with the central canal of the spinal cord. The four ventricles consist of the two lateral… …   Medical dictionary