Sclera

 

This is a white fibrous tissue which contains flattened cells and fibers. It is thinnest at the enter of the optic nerve where it forms the sieve- like lamina cribrosa. The long and short ciliary nerves and arteries piece it obliquely around the optic nerve. It is also pierced by choroidal veins (venae vorticosae). It forms cornea at the corneoscleral junction which is pierced by structures that runs in the eyeball, which includes arteries and nerves as follows

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Long and short ciliary nerves

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Anterior ciliary arteries

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Posterior ciliary arteries which give rise to 

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Long posterior ciliary arteries

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Short posterior ciliary arteries.

These two arteries form anastomoses along sclera and cornea to form two circles
 

1. Greater arterial circle, which has a wide diameter and

2. Lesser arterial circle

Sclera is relatively avascularized when compared with choroid.

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