Limiting Membranes of the Sensory Retina and Pigment Epithelium

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Abstract
The term "internal limiting membrane of the retina (membrana limitans interna)" has been applied in the past to both the surface created by the inner expansions of Miiller's "fibers"1 and to the cuticular layer that lies upon them.2,3 A second cuticular layer or "membrane" is present on the outermost surface of the retina, applied to the bases of the retinal pigment epithelial cells (the inner lamella of the glass membrane of the choroid ).2 The homology between these two cuticular layers was pointed out by Arey,4 who also drew attention to a similar homology between the "external limiting membrane of the retina" and a less widely appreciated "membrane" in the pigment epithelium. This latter "membrane" has been known variously as the "membrana reticularis retinae,"5 the "fenestrated membrane,"6 or the "cement substance"2 of the retinal pigment epithelium. The cuticular membranes (i.e., the internal limiting membrane

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