Fig. 44. Diagram of ciliary body vasculature. A. Branches of anterior ciliary perforating artery (ACA) and long posterior ciliary artery (LPCA). ACA branches: 1. Branches forming the intramuscular circle. 2. Branch to MACI, especially contributing to the superior and inferior circle. 3. Branch to outer and posterior ciliary muscle. 4. Recurrent artery to peripheral choroid. 5. Branch to iris. LPCA branches: 6. Primary branches supplying the MACI. 7. Branch to the intramuscular circle. B. Major arterial circle of the iris (MACI) and its branches to ciliary process. 1. Arteriole to base and anterior edge of the ciliary process. 2. Arteriole directly to marginal venous sytem. 3. Arteriole supplying middle of ciliary process through venous capillaries to marginal venule. 4. Arteriole to posterior ciliary process and minor processes. 5. Marginal venule. 6. Arteriole to iris. 7. Iris vein. 8. Arteriole to anterior and inner ciliary muscle. 9. Pars plana veins. (Compiled from multiple sources: Funk R, Rohen JW: Exp Eye Res 47:653, 1988 and 51:651, 1990; Morrison JC, Van Buskirk EM: Ophthalmology 90:707, 1983; Am J Ophthalmol 97:372,1984; and Morrison, unpublished).