Fig. 6. A cast of the vasculature within a single ciliary process. The major circle of the iris (MAC) gives rise to an anterior (arrow) and posterior (arrowhead) arteriole. Double arrow denotes choroidal vein (CV). Drainage from ciliary muscle to choroidal veins has been removed at asterisk. (From Morrison JC, Van Buskirk EM, Freddo T. Anatomy, microcirculation and ultrastructure of the ciliary body. In: Ritch R, Shields MB, Krupin T (eds). The Glaucomas. St Louis: CV Mosby, 1989.)