Figure 4. . Rhabdomeric and ciliary photoreceptors and their homologies.

Figure 4.

Rhabdomeric and ciliary photoreceptors and their homologies. Conservation of cell polarity and topology between Drosophila rhabdomeric photoreceptor (left) and vertebrate rod photoreceptor (right). The center image pair, in top and side view, depicts an ancestral (or an immature) photoreceptor, which can evolve (or develop) into either of the two illustrated final forms simply by different modes of expansion of the apical membrane (pink); that apical membrane is separated from the baso-lateral membrane (yellow) by a zonula adherens (ZA, brown). r, rhabdomere; s, fly stalk; os, outer segment; cc, connecting cilium; is, inner segment; ELM, external limiting membrane; N, nucleus. From Ready & Tepass (40).

From: Evolution of Phototransduction, Vertebrate Photoreceptors and Retina

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Webvision: The Organization of the Retina and Visual System [Internet].
Kolb H, Fernandez E, Nelson R, editors.
Salt Lake City (UT): University of Utah Health Sciences Center; 1995-.
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