POLIGONO DE WILLIS PDF

The Circle of Willis is an arterial polygon heptagon formed as the internal carotid and vertebral systems anastomose around the optic chiasm and infundibulum of the pituitary stalk in the suprasellar cistern. This communicating pathway allows equalization of blood-flow between the two sides of the brain, and permits anastomotic circulation, should a part of the circulation be occluded. The basilar artery divides at the upper border of the pons to form the left and right PCAs. The ACAs are united by the ACOM, a small vessel that runs in the chiasmatic cistern below the rostrum of the corpus callosum , to complete the circle. Branches of the circle of Willis also supply the optic chiasm and tracts , infundibulum , hypothalamus and other structures at base of brain:.

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Anatomia das artérias do cérebro e do polígono de Willis em angio-RM (sequência TOF)

El trastorno del riego cerebral posterior, es bien conocido como Insuficiencia Vertebral-Basilar. El drenaje venoso del cerebro se puede separar en dos subdivisiones: superficial y profundo. Esta vena se fusiona con el seno sagital inferior para formar el seno recto que, a su vez, se une al sistema venoso superficial mencionado anteriormente en la confluencia de los senos. En un individuo sano debe estar por encima de 50 mmHg. La RCV se controla mediante cuatro mecanismos principales:. De Wikipedia, la enciclopedia libre.

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Circulación cerebral

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