Figure 82-3 The origin, course, and branches of the ophthalmic artery, including the posterior ciliary arteries, as seen from above. CAR, central retinal artery; Col Br, collateral branches; CZ, circle of Zinn and Haller; ICA, internal carotid artery; LPCA, lateral posterior ciliary artery; MPCA, medial posterior ciliary artery; OA, ophthalmic artery. (From Pillanut LE, Harris A, Anderson DR, Greve EL [eds]: Current Concepts on Ocular Blood Flow in Glaucoma. The Hague, Netherlands, Kugler, 1999.)