The circle of Willis is a circulatory anastomosis that supplies blood to the brain and surrounding structures.
The circle of Willis is formed when the internal carotid artery (ICA) enters the cranial cavity bilaterally and divides into the anterior cerebral artery (ACA) and middle cerebral artery (MCA). The anterior cerebral arteries are then united by an anterior communicating (ACOM) artery. The circle of Willis (circulus arteriosus cerebri) is an anastomotic system of arteries that sits at the base of the brain. The “circle” was named after Thomas Willis by his student Richard Lower. Willis was the author of Cerebri Anatome, a book that described and depicted this vascular ring The circle of Willis is a part of the cerebral circulation and is composed of the following arteries: 1  Anterior cerebral artery (left and right). 2  Anterior communicating artery. 3  Internal carotid artery (left and right). 4  Posterior cerebral artery (left and right). 5  Posterior communicating artery (left and right). (Redirected from Circle of willis). 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. It is named after Thomas Willis (1621–1675), an English physician Okay so this is a tutorial on the Circle of Willis. The Circle of Willis provides the blood supply to the brain, and essentially what happens is that it connects two arterial sources together to form this arterial circle, which then supplies the brain with blood.  The Circle of Willis is a ring or circle of arteries located at the base of the brain. It is also known by several other names, most commonly the cerebral arterial circle and arterial Circle of Willis. This part of the brain was first discovered by the English doctor Thomas Willis in the 17th century. The Circle of Willis is a ring or circle of arteries located at the base of the brain. The arteries in the Circle of Willis may be enough to preserve blood flow to the brain even if one artery is constricted or blocked. Overview. The circle of Willis (circulus arteriosus cerebri) is an anastomotic system of arteries that sits at the base of the brain. The “circle” was named after Thomas Willis by his student Richard Lower. Willis was the author of Cerebri Anatome, a book that described and depicted this vascular ring Formation. The circle of Willis is formed by two group of arteries-the internal carotid arteries and two vertebral arteries. These arteries provide the anterior and posterior circulation of the brain respectively.  Circle of Willis: A critical arterial circle at the base of the brain. The circle of Willis receives all the blood that is pumped up the two internal carotid arteries that come up the front of the neck. All the principal arteries that supply the two halves of the brain (hemispheres) branch off from the circle of Willis.
http://emedicine.medscape.com/article/1877617-overview https://en.wikipedia.org/wiki/Circle_of_willis http://anatomyzone.com/tutorials/cardiovascular/circle-of-willis/ http://www.wisegeek.com/what-is-the-circle-of-willis.htm http://emedicine.medscape.com/article/1877617-overview https://www.kenhub.com/en/library/anatomy/circle-of-willis http://www.medicinenet.com/script/main/art.asp?articlekey=9145
what is the circle of willis