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pigment epithelium |
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pigment epithelium [‚pig·mənt ‚ep·ə′thē·lē·əm] (histology) A heavily pigmented layer of epithelial cells interposed between the photoreceptors of the vertebrate retina and their blood supply, the choroid. It forms a barrier regulating the exchange of fluids and substances between the blood and outer layer of the retina; it also plays a number of roles in support of photoreceptor structure and function in vertebrates. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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