Fig. 13. Latex injection of choroidal vessels. A. The outer aspect (scleral view) of the choriocapillaris and an end artery. The transition from arteriole (a) to choriocapillaris may be subtle, but still one can discern an abrupt change in the course and caliber of vessel. B. The choriocapillaris shows an abrupt ending around the optic disc. This finding indicates that the choriocapillaris is not directly involved in the disc circulation. (Shimizu K, Ujiie K: In Delaey JJ, ed: Fluorescein angiography and angioarchitecture of the choroid. International Symposium on Fluorescein Anglography. Doc Ophthalmol 9:187, 1976)