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Ciliary body From Wikipedia, the free encyclopedia Jump to: navigation, search Ciliary body Schematic diagram of the human eye Latin corpus ciliare Gray's subject #225 1010 Artery long posterior ciliary arteries MeSH Ciliary+Body The ciliary body is the circumferential tissue inside the eye composed of the ciliary muscle and ciliary processes.[1] It is triangular in horizontal section and is coated by a double layer, the ciliary epithelium. This epithelium produces the aqueous humor.[2] The inner layer is transparent and covers the vitreous body, and is continuous from the neural tissue of the retina. The outer layer is highly pigmented, continuous with the retinal pigment epithelium, and constitutes the cells of the dilator muscle. This double membrane is often regarded to be continuous with the retina and a rudiment of the embryological correspondent to the retina. The inner layer is unpigmented until it reaches the iris, where it takes on pigment. The retina ends at the ora serrata. It is part of the uveal tract— the layer of tissue which provides most of the nutrients in the eye. It extends from the ora serrata to the root of the iris. There are three sets of ciliary muscles in the eye, the longitudinal, radial, and circular muscles. They are near the front of the eye, above and below the lens. They are attached to the lens by connective tissue called the zonule of Zinn, and are responsible for shaping the lens to focus light on the retina. The ciliary body receives parasympathetic innervation from the oculomotor nerve.

Contents [hide] 1 Functions 2 Clinical significance 3 See also 4 References 5 External links

[edit] Functions The ciliary body has three functions: accommodation, aqueous humor production and the production and maintenance of the lens zonules. It also anchors the lens in place. Accomommodation essentially means that when the ciliary muscle contracts, the lens becomes more convex, generally improving the focus for closer objects. When it relaxes,it flattens the lens, generally improving the focus for farther objects. One of the essential roles of the ciliary body is also the production of the aqueous humor, which is responsible for providing most of the nutrients for the lens and the cornea and involved in waste management of these areas.

[edit] Clinical significance It is the main target of drugs against glaucoma (apraclonidine), as the ciliary body is responsible for aqueous humor production; lowering aqueous humor production will cause a subsequent drop in the intraocular pressure.

[edit] See also Iridodialysis [edit] References ^ Cassin, B. and Solomon, S. Dictionary of Eye Terminology. Gainsville, Florida: Triad Publishing Company, 1990. ^ Lang, G. Ophthalmology: A Pocket Textbook Atlas, 2 ed.. Pg. 207. Ulm, Germany. 2007. [edit] External links Ciliary+body at eMedicine Dictionary Histology at BU 08011loa Atlas of anatomy at UMich eye_1 - "Sagittal Section Through the Eyeball" [hide]v • d • eSensory system – visual system – globe of eye (TA A15.2.1-6, GA 10.1005) Fibrous tunic (outer) Sclera Episcleral layer • Schlemm's canal • Trabecular meshwork Cornea Limbus • layers (Epithelium, Bowman's, Stroma, Descemet's, Endothelium) Uvea/vascular tunic (middle) Choroid Capillary lamina of choroid • Bruch's membrane • Sattler's layer Ciliary body Ciliary processes • Ciliary muscle 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 Other Macula • Foveola • Fovea • Optic disc (Cup) Anterior segment Anterior chamber • Aqueous humour • Posterior chamber • Lens (Capsule of lens, Zonule of Zinn) Posterior segment Vitreous humour Other Ocular immune system • Tapetum lucidum • Keratocytes M: EYE anat(g, a, p)/phys/devp/cell noco/cong/tumr, epon proc, drug(S1A/1E/1F/1L)

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