Long posterior ciliary arteries
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
The long posterior ciliary arteries, two in number, pierce the posterior part of the sclera at some little distance from the optic nerve, and run forward, along either side of the eyeball, between the sclera and choroid, to the ciliary muscle, where they divide into two branches.
These form an arterial circle, the circulus arteriosus major, around the circumference of the iris, from which numerous converging branches run, in the substance of the iris, to its pupillary margin, where they form a second arterial circle, the circulus arteriosus minor.
The long posterior ciliary arteries supply the iris, ciliary body and choroid.