Circle of Zinn

Last revised by Frank Gaillard on 17 Jul 2023

The circle of Zinn is an arterial anastomotic ring surrounding the optic nerve head in the sclera formed by branches of the short posterior ciliary arteries. Multiple small branches from the circle of Zinn supply the anterior pia of the optic nerve, the optic disc and contribute to the blood supply of the posterior choroid 1.

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