circle of Willis

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circle of Willis

[′sər·kəl əv ′wil·əs]
(anatomy)
A ring of arteries at the base of the cerebrum.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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This aim of this study is to describe with sections and photographies the arterial pattern of the cerebral arterial circle, its branches, its anastomoses and the manner that it supply the brain of the one-humped camel, which will provide valuable information for both anatomists and physiologists.
Complete configuration of the circle was considered when both anterior and posterior parts of the arterial circle formed a complete circle, while partially complete configuration meant either anterior or posterior parts of the arterial circle formed a complete circle.12 Incomplete configuration meant that neither anterior nor posterior part of the circle formed a complete circle.12
The anatomical variants of the cerebral arterial circle have been described in cadaveric studies by digital subtraction angiography (DSA), magnetic resonance angiography (MRA) and computed tomographic angiography (CTA).
Only after few millimeters, it was divided into two branches at the base of the encephalon: the rostral cerebral artery and the communicating caudal artery, that formed the arterial circle of the base of the encephalon, previously called circle of Willis.
SUMMARY: The conformation of the arterial circle of the base of the brain has relevancy in the neurochirurgical clinic as the complex relation that there present the arteries that originate it and its great variability.
Biometrical Analysis of the Anterior Communicating Artery and the Anterior Cerebral Artery in the Precommunicating Segment of the Cerebral Arterial Circle

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