Figure 232

Schematic diagram illustrating the internal structures of the human eye. The retina consists of photosensitive and nonphotosensitive regions that differ in their function. Note that the photosensitive region of the retina occupies the posterior part of the eye and terminates anteriorly along the ora serrata. The nonphotosensitive region of the retina is located anterior to the ora serrata and lines the inner aspect of the ciliary body and the posterior surface of the iris. The other layers of the eyeball as well as the attachment of two of the extraocular muscles to the sclera are also shown.

ora serrata inferior rectus muscle ora serrata posterior chamber lens capsule sclera choroid retina retinal arterioles and venules optic nerve papilla optic nerve central retinal artery and vein retinal pigment epithelium ciliary body conjunctiva canal of Schlemm anterior chamber pupil cornea jects. The aqueous humor and vitreous body have only minor roles in refraction. However, the aqueous humor plays an important role in providing nutrients to two avascular structures, the lens and cornea. In addition to transmitting light, the vitreous body helps maintain the position of the lens and helps keep the neural retina in contact with the RPE.

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