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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“Men go out to admire the heights of mountains, the huge waves of the sea, the broadest spans of rivers, the circle of ocean, the revolutions of stars, and leave themselves behind.”
—St. Augustine (354–430)
“Yes, thou art gone! and round me too the night
In ever-nearing circle weaves her shade.”
—Matthew Arnold (1822–1888)
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