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The pars plana (also known as orbicularis ciliaris ) (Latin: flat portion) is part of the ciliary body in the uvea (or vascular tunic, the middle layer of the three layers that comprise the human eye).
It is about 4 mm long, located near the junction of the iris and sclera, and is scalloped in appearance.
The pars plana may not have a function in the post-Fetus period, making this a good site of entry for Eye surgery of the posterior segment of eyeball; this surgery is known as pars plana vitrectomy.
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