Fig. 34. Almost completely fused embryonic (or optic) fissure has discarded cells around the contacting margins of the optic cup (arrow). Arrowhead indicates pigment epithelium (PE) without pigment granules around the region of fusion. Hy, arborization of hyaloid artery; Le, lens; NEp, neural epithelium. (Phase contrast, × 450; courtesy of Professor Vrabec.)