Willis, circle of
The circle of Willis is an arterial circle of critical importance at the base of the brain. It is called an arterial anastomosis, a joining of arteries. The circle of Willis receives all of the blood pumped up the two internal carotid arteries (that come up the front of the neck) and the basilar artery formed by the union of the two vertebral arteries (that come up the back of the neck). All of the principal arteries supplying cerebral hemispheres of the brain come off of the circle of Willis.

Medical dictionary. 2011.

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  • Willis circle cord etc. — Wil·lis circle, cord, etc. (wilґis) [Thomas Willis, English anatomist and physician, 1621–1675] see circulus arteriosus cerebri and nervus accessorius, and see under cord and paracusis …   Medical dictionary

  • Circle of Willis — Artery: Circle of Willis Schematic representation of the Circle of Willis, arteries of the brain and brain stem …   Wikipedia

  • Circle of Willis — The circle of Willis is an arterial circle of critical importance at the base of the brain. It is called an arterial anastomosis, a joining of arteries. The circle of Willis receives all of the blood pumped up the two internal carotid arteries… …   Medical dictionary

  • Willis Hall — (6 April 1929 7 March 2005) was an English playwright and radio and television writer who drew on his working class Leeds roots in much of his material. His most famous creation was probably Billy Liar (1960), co written with life long friend and …   Wikipedia

  • circle of Wil|lis — «WIHL ihs», Anatomy. a circle formed by several connecting cerebral arteries at the base of the brain. ╂[< Thomas Willis, 1621 1675, an English anatomist] …   Useful english dictionary

  • Circle of Life — This article is about the song. For the film, see Circle of Life: An Environmental Fable. For the album, see The Circle of Life. Circle of Life Single by Elton John from the album …   Wikipedia

  • circle — 1. [TA] In anatomy, a ring shaped structure or group of structures, as formed by anastomosing arteries or veins, or by connected (communicating) nerves, 2. A line or process with every point approximately equidistant from the center. SYN:… …   Medical dictionary

  • circle of Willis — a circle on the undersurface of the brain formed by linked branches of the arteries that supply the brain. Most cerebral aneurysm occur on or near the circle of Willis. T. Willis (1621 75), English anatomist …   Medical dictionary

  • circle of Willis — a circle on the undersurface of the brain formed by linked branches of the arteries that supply the brain . Most cerebral aneurysms occur on or near the circle of Willis. [Willis (1621–75), English anatomist] …   The new mediacal dictionary

  • willis's circle — noun Usage: usually capitalized W Etymology: after Thomas Willis died 1675 : circle of willis …   Useful english dictionary

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