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Eye, retina

Note that the appearance of the retina varies with location.  The concentration of cells (and resulting thickness of the retina) decreases toward the periphery (i.e., with increasing distance from the macula).

Retinal layers

Formation of neural retina and pigmented epithelium

The retina forms from the optic vesicle, which evaginates from the neuroectodermal diencephalic vesicle.  The optic vesicle remains attached to developing brain; the connection between optic and diencephalic vesicles becomes the optic nerve

The optic vesicle itself collapses into a cup.  The front surface of this vesicle (the hollow of the cup) becomes the neural retina, while the back surface becomes the retina's pigmented epithelium

Although cells of the pigmented epithelium are intimately associated with outer segments (rods and cones) of receptor cells, this surface where the neural retina contacts the pigmented epithelium is inherently extremely fragile and is the site where retinal detachment can occur.

 

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Comments and questions: dgking@siu.edu

SIUC / School of Medicine / Anatomy / David King

http://www.siumed.edu/~dking2/ssb/EE020b.htm
Last updated:  30 November 2004 / dgk