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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]
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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. 21:24, 17 March 2014: 471 × 750 (12 KB) Rehua: text fix: 22:25, 26 February 2012: 471 × 750 (15 KB) Rehua ...
In case of narrowing of other arteries of the circle of Willis or the arteries supplying the circle, the anterior communicating artery can provide a way to supply blood to the opposite (affected) side of the circle. This can often preserve the cerebral blood supply well enough to avoid the symptoms of ischemia. [7]
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. 18:52, 13 February 2010: 458 × 745 (217 KB) DaniDF1995: fix: 16:07, 24 March 2008: 458 × 745 (206 KB) Aracuano
Magnetic resonance angiography (MRA) is a group of techniques based on magnetic resonance imaging (MRI) to image blood vessels. Magnetic resonance angiography is used to generate images of arteries (and less commonly veins) in order to evaluate them for stenosis (abnormal narrowing), occlusions, aneurysms (vessel wall dilatations, at risk of rupture) or other abnormalities.
Olivary body. Inferior olivary nucleus; ... Circle of Willis (arterial system) ... "Brain Map". Queensland Health. 12 July 2022.