Pars plana
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. p. 47.
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Anatomy of the globe of the human eye
(outer)
Sclera |
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Cornea |
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tunic (middle)
Choroid | |
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Ciliary body |
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Iris |
Layers | |
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Cells |
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Other |
of the eye
Anterior segment | |
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Posterior segment |
- Keratocytes
- Ocular immune system
- Optical coherence tomography
- Eye care professional
- Eye disease
- Refractive error
- Accommodation
- Physiological Optics
- Visual perception
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