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.
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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.
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).
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