Fig. 12. Major arteries and veins of the choroid. Anterior ciliary arteries (arrow, upper left) and the long posterior ciliary artery (broad arrow, lower right) supply the major arterial circle of the iris. Arteries from the major circle (not shown) and anterior part of the long posterior ciliary artery send recurrent branches to the anterior and equatorial choriocapillaris. Short posterior ciliary arteries (arrows, lower left) supply the choriocapillaris posteriorly. The two systems overlap. Vortex veins (open arrow) drain blood from most of iris, ciliary body, and choroid. (Courtesy of Stephen Gordon)