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The circle of Willis (also called Willis' circle, loop of Willis, cerebral arterial circle, and Willis polygon) is a circulatory anastomosis that supplies blood to the brain and surrounding structures in reptiles, birds and mammals, including humans. [1] It is named after Thomas Willis (1621–1675), an English physician. [2]
There are many examples of normal arterio-arterial anastomoses in the body. Clinically important examples include: Circle of Willis (in the brain) Coronary: anterior interventricular artery and posterior interventricular artery of the heart; Scapular anastomosis (for the subclavian vessels)
This image is a derivative work of the following images: File:Circle_of_Willis_en.svg licensed with PD-self . 2007-01-24T20:31:48Z Rhcastilhos 471x750 (38685 Bytes) {{Information |Description= Schematic representation of the circle of Willis, arteries of the brain and brain stem. |Source=Gray519.png |Date=01/24/2007 |Author=Rhcastilhos |Permission= |other_versions= }}
Better draw (more realistic). Bigger font size. Labels in colors. Added labels: Recurrent artery of Heubner and posteromedial central arteries, Circle of Willis, A1, A2, P1, P2. Correct arising for labyrinthine arteries. Use of layers. 20:33, 24 January 2007: 471 × 750 (39 KB) PbBR8498
Better draw (more realistic). Bigger font size. Labels in colors. Added labels: Recurrent artery of Heubner and posteromedial central arteries, Circle of Willis, A1, A2, P1, P2. Correct arising for labyrinthine arteries. Use of layers. 21:24, 17 March 2014: 471 × 750 (12 KB) Rehua: text fix: 22:25, 26 February 2012: 471 × 750 (15 KB) Rehua ...
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The two anterior cerebral arteries arise from the internal carotid artery and are part of the circle of Willis. The left and right anterior cerebral arteries are connected by the anterior communicating artery. Anterior cerebral artery syndrome refers to symptoms that follow a stroke occurring in the area normally supplied by one of the arteries.
Manufacturers of baby powder and cosmetic products made with talc will have to test them for asbestos under a proposal announced by the U.S. Food and Drug Administration.