The Circle of Willis (also called Willis' Circle, Loop of Willis, cerebral arterial circle, and Willis Polygon) is a circle of arteries that supply blood to the brain and surrounding structures. It is named after Thomas Willis (1621–1675), an English physician.
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“The passion of love is essentially selfish, while motherhood widens the circle of our feelings.”
—Honoré De Balzac (1799–1850)
“... in any war a victory means another war, and yet another, until some day inevitably the tides turn, and the victor is the vanquished, and the circle reverses itself, but remains nevertheless a circle.”
—Pearl S. Buck (1892–1973)
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