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General Anatomy > Sense organs > Eye and related structures > Eyeball > Fibrous layer of eyeball

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The sclera and cornea form the fibrous layer of eyeball (fibrous tunic of the bulb) of the eye; the sclera is opaque, and constitutes the posterior five-sixths of the tunic; the cornea is transparent, and forms the anterior sixth.

This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from


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