The inner layer of the eye, which lines the vascular uvea, is the neurosensory layer. This layer forms the retina posteriorly; but, anteriorly it comes to line the inner surface of the ciliary body and iris as a two-layered pigment epithelium. These same layers can be traced into the retina, which is composed of an outer pigment epithelium and an inner sensory part, which contains the rods and cones, bipolar cells and ganglion cells (Figure 2.4). The junction of the retina and the pars plana forms a scalloped border known as the ora serrata.
It is important to note that the photoreceptor cells are on the external side of the sensory retina. The relationship of the retinal elements can be understood most readily by following the formation of the optic cup. As the single-cell layer optic vesicle "invaginates" to form the two-cell layered optic cup, the initially superficial cells become the inner layer of the cup. The RPE develops from the outer layer of the cup, facing the photoreceptors across the now obliterated cavity of the optic vesicle. The neurons of the sensory retina differentiate from the inner layer of the optic cup.
Figure 2.5. Blood supply of the eye.03
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