Blood supply to the optic nerve and ON head structure

Blood supply to the optic nerve and ON head structure. The blood supply is primarily from the ophthalmic artery. The posterior ON is supplied by pial branches of the ophthalmic artery posteriorly and the posterior ciliary arteries anteriorly; the supply to the central region is limited to the branches that penetrate deeply. The ON head is supplied by the circle of Zinn, from the short posterior ciliary arteries, and from choroidal vessels. The cup-to-disc ratio is the diameter of the central cup divided by diameter of the entire disc | Biousse V, Newman NJ. Ischemic optic neuropathies. N Eng J Med. (2015) 372:2428–36. 10.1056/NEJMra1413352

Blood supply to the optic nerve and ON head structure

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