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File-060 - BIO 183 File-060 McCague HISTOLOGY OF THE EYE...

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BIO 183 McCague File-060 HISTOLOGY OF THE EYE The visual organ is primarily the eyeball and its parts the optic nerve. Structural Plan : The spheroidal eyeball consists of 3 coats that enclose refractive media. 1. Outer: tunica fibrosa – mostly sclera but transparent cornea anteriority. 2. The middle coat is the vascular & pigmented tunica vasculosa (or uvea) – mostly unspecialized choroids. Near the front it becomes the muscular ciliary body and the iris. The iris end about a circular opening called the pupil . 3. The inner coat is the tunica interna or retina . The nerve fibers gather posteriorly and leave the eyeball as the optic nerve . This coat becomes insensitive where it lines the ciliary body & iris. A refractive crystalline lens lies just behind the pupil & iris. The lens is a flexible continuous growing protein layered transparent structure. It is held in place and influenced to change in shape by 70 suspensory ligaments . This ciliary zonule is a system of fibers that radiate to the muscular ciliary body. The eyelids are movable folds of skin that can cover fully the front of the eyeball.
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