Fig. 23 Main figure. The rod outer segment (R) with discs is surrounded by pigment epithelial villi (arrowheads) and pigment granules (Pi) from the enveloping pigment epithelial cell (original magnification ×48,000). Inset. The interdigitation of the pigment epithelial cells (I) and the rod outer segments (2) places the outer segments near the apical pigment granules. (3) Inner segments. The external limiting membrane (arrowhead) lies internal to this region (original magnification ×720).