Medicine:Pars plana
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The pars plana (also known as orbicularis ciliaris [1]) (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.
References
- ↑ Lee Ann, Remington. Clinical anatomy and physiology of the visual system (3 ed.). Elsevier. pp. 47.
| 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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