Pars plicata

Short description: Portion of the eye

The pars plicata (also known as corona ciliaris [1]) (Latin: folded portion) is the folded and most anterior portion of the ciliary body of an eye. The ciliary body is a part of the uvea, one of the three layers that comprise the eye. The pars plicata is located anterior to the pars plana portion of the ciliary body, and posterior to the iris. The lens zonules that are used to control accommodation are attached to the pars plana.

The pars plicata is the portion of the ciliary body that is responsible for producing aqueous humor, the fluid of the anterior chamber.[2] The production of too much aqueous humor, or reabsorption that occurs too slowly, can lead to increases in the pressure within the eye.

## References

1. ↑ Lee Ann, Remington. Clinical anatomy and physiology of the visual system (3rd ed.). Elsevier. pp. 47.
2. ↑ Kumar, Vinay (2007). "Eye, Anterior Segment". Robbins basic pathology (8th ed.). Philadelphia: Saunders/Elsevier. ISBN 978-1416029731.

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Anatomy of the globe of the human eye

Fibrous tunic (outer)|

| Sclera|

* Episcleral layer
* Schlemm's canal
* Trabecular meshwork

|

Cornea|

* Limbus
* layers
* Epithelium
* Bowman's
* Stroma
* Dua's layer
* Descemet's
* Endothelium

Uvea/vascular tunic (middle)|

| Choroid|

* Capillary lamina of choroid
* Bruch's membrane
* Sattler's layer

|

Ciliary body|

* Ciliary processes
* Ciliary muscle
* Pars plicata
* Pars plana

Iris|

* Stroma
* Pupil
* Iris dilator muscle
* Iris sphincter muscle

Retina (inner)|

| Layers|

* Inner limiting membrane
* Nerve fiber layer
* Ganglion cell layer
* Inner plexiform layer
* Inner nuclear layer

* Outer plexiform layer
* Outer nuclear layer

* External limiting membrane
* Layer of rods and cones
* Retinal pigment epithelium

|

Cells|

* Photoreceptor cells (Cone cell, Rod cell) → (Horizontal cell) → Bipolar cell → (Amacrine cell) → Retina ganglion cell (Midget cell, [[Biology:Parasol cParasol cell, [[Bistratified cell]], Giant retina ganglion cells, Photosensitive ganglion cell) → Diencephalon: P cell, M cell, K cell, Muller glia

Other|

* Macula
* Perifoveal area
* Parafoveal area
* Fovea
* Foveal avascular zone
* Foveola
* Optic disc
* Optic cup
* Ora serrata

Anatomical regions of the eye|

| Anterior segment|

* Adnexa
* Fibrous tunic
* Anterior chamber
* Aqueous humour
* Iris
* Posterior chamber
* Ciliary body
* Lens
* Capsule of lens
* Zonule of Zinn

|

Posterior segment|

* Vitreous chamber
* Vitreous body
* Retina
* Choroid

Other|

* Keratocytes
* Ocular immune system
* Optical coherence tomography
* Eye care professional
* Eye disease
* Refractive error
* Accommodation
* Physiological Optics
* Visual perception

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