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Ocular Pathology Study Guide: IRIS (728 words) |
 | The iris contains pigmented cells and muscle and is composed of four layers: the anterior border layer, the stroma, the dilator muscle layer and the posterior epithelium. |
| The nerves of the choroid and iris are the long and short ciliary; the former being branches of the nasociliary nerve, the latter of the ciliary ganglion. |
| The dilator muscle layer is composed of the contractile processes of the myoepithelial cells of the inner layer of the posterior epithelium; it extends from the base of the iris to the sphincter muscle. |
| The Iris (1053 words) |
| The iris, visible through the clear cornea as the colored disc inside the eye, is a thin diaphragm composed mostly of connective tissue and smooth muscle fibers. |
| The iris divides the anterior compartment, the space separating the cornea and the lens, into the anterior chamber (between the cornea and the iris) and the posterior chamber (between the iris and the lens). |
| Anatomical structures posterior to the iris, which also are part of the uvea, are the ciliary body (within which is the ciliary muscle which controls the shape of the crystalline lens) and the choroid (located underneath the retina and which contains the retinas blood supply). |
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