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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[5,6] By applying the last two mentioned methods in combination with a compression test on the internal carotid artery can be analyzed collateral circulatory cability of the Willis circle.
The main objective of this work was to measure the diameters of blood vessels that are part of the Willis circle using specially designed software in people with normal cerebrovascular status.
The results obtained in this study are shown in Table 1 and represent a systematic review of the diameters of the blood vessels that form the Willis circle. The table shows that the diameters of the blood vessels in Willis circle are larger for subjects in younger age group, except the diameter of the internal carotid artery, which in people aged over 60 years showed a larger diameter by 0.2-0.3 mm compared to the younger group of respondents.