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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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Maryland Route 396 (MD 396) is a state highway in the U.S. state of Maryland. Known as Massachusetts Avenue, the highway runs 2.23 miles (3.59 km) from MD 614 southeast to Westmoreland Circle near the District of Columbia boundary in Bethesda. MD 396 is an extension of Washington's Massachusetts Avenue into southwestern Montgomery County.
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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]
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= }}
Her stepfather, Michael Willis, who raised Emily as his own, told TMZ on March 29 that she is now awake but remains in a "vegetative state." Still, the family underscored that there have been some ...
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