The<unk>  <unk>  is a one cell thick layer of cuboidal cells lying behind the<unk> . The epithelial cells are highly<unk> ed due to the numerous large melanosomes which pack the cytoplasm of each cell. Towards the central axis, the<unk>  terminates at the pupillary margin. Peripherally, the<unk>  is continuous with the inner, non-pigmented layer of the ciliary<unk> . The<unk>  dilator muscle is strictly attached to the anterior side of the<unk><unk> ed<unk>  and represents the anterior continuation of the<unk> ed ciliary<unk> . The ciliary epithelia represent the anterior continuation of the multilayered retina, whose retinal<unk> ed<unk>  (RPE) corresponds to the<unk> ed ciliary<unk> , while the multilayered sensory retina fades into the non-pigmented ciliary<unk> . Despite their very different functions and histological appearances, these regions have a common origin from the two layers of the embryological optic cup. The melanosomes of the<unk>  are distinctive, being larger, blacker and rounder than those in the ciliary<unk>  or RPE.
Iris pigment epithelium
Corneal endothelium
Retinal nerve fiber layer
Macula of retina
Corneal keratocyte
Layer of rods and cones
Corneal limbus
Scleral lens