Corneoscleral Tunic

Here is a section through all three tunics of the eye. The innermost tunic is the retina. The outermost corneoscleral tunic is here seen as the sclera, the tough collagenous bag comprising the outer surface of the eyeball, onto which the muscles which move the eye insert.

In between these two is the uveal tunic. The uvea is devoted to nourishment and support for the retina. The very heavily pigmented region in the middle of this section is the choroid portion of the uveal tunic, which has this function, as well as that of reducing internal reflections. Other parts of the uveal tunic include the ciliary body and the iris.

Monkey eye; H&E stain, paraffin section

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