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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“They will mark the stone-battlements
And the circle of them
With a bright stain.
They will cast out the dead
A sight for Priams queen to lament
And her frightened daughters.”
—Hilda Doolittle (18861961)
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The pale which held that lovely deer;
My joy, my grief, my hope, my love,
Did all within this circle move!”
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