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 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-fetal period, making this a good site of entry for ophthalmic surgery of the posterior segment of eyeball; this surgery is known as pars plana vitrectomy.
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Fibrous tunic (outer) |
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Uvea / vascular tunic (middle) |
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| Retina (inner) |
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| Anatomical regions of the eye |
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