The cells of the iridial retina are so full of pigment that very little cellular detail, except for occasional blue nuclei, can be seen. The anterior surface of the iris has no distinct cellular layer, and the stroma of the iris is continuous with the aqueous humor of the anterior chamber. On its anterior surface, up against the iridial stroma, a thin, blue-staining band can be found in many sections. This is the iridial dilator. The iridial dilator muscle is comprised of the elongated processes of the anterior-most layer of the double layer of cuboidal cells that constitute the iridial retina.
Ciliary retina extends from the ora serrata to the posterior surface of the root of the iris.
The ora serrata is not detectable in this primate specimen, since the transition from ciliary retina to photosensitive retina is gradual. Stroma in the fimbriae is very vascularized. A plastic section taken from somewhere behind the ora serrata, thus includes the photosensitive retina. All of the layers of the photosensitive retina are mentioned below. Identify only the underlined structures.