Fig. 5 Schematic drawing of the distribution of the ciliary arteries. IMC, intramuscular ciliary arterial circle; MAC, major arterial circle of the iris; PCA, posterior ciliary artery; ACA, anterior ciliary arteries; lpca, long posterior ciliary artery; a, recurrent branch of the long posterior ciliary artery; b, long posterior ciliary artery; c, recurrent branch of the long posterior ciliary artery; d, anterior choroidal branch of the ciliary intramuscular circle; e, branch of the IMC; f, iris artery arising from a ciliary process branch of the MAC; g, branch to the anterior choroid from the anterior ciliary artery; h, branch to the anterior choroid from the MAC; i, iris artery arising from the MAC branch to the choroid; j, iris artery arising from the anterior ciliary artery. (Reprinted with permission from Bron AJ, Tripathi RC, Tripathi BJ. Wolff's Anatomy of the Eye and Orbit, 8th Edition. London: Chapman Hall Medical, 1997)