Ciliary Body


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ciliary body

[¦sil·ē‚er·ē ¦bäd·ē]
(anatomy)
A ring of tissue lying just anterior to the retinal margin of the eye.

Ciliary Body

 

in terrestrial vertebrates, including humans, the part of the eye that converts blood serum into the intraocular fluid that is secreted into the posterior chamber of the eye. The ciliary body forms a circle of numerous radial folds (70 to 80 in humans) on the internal surface of the eye between the iris and the retina. It consists of mesodermal stroma and two neuroepithelia. The external pigmented neuroepithelium is a continuation of the pigmented epithelium of the retina, whereas the nonpigmented internal layer, which plays a major role in the secretion of intraocular fluid, is a continuation of the retina proper.

Fibers of the zonule of Zinn are attached to the basal membrane of the ciliary folds. The amount of tension of the ligament is determined by contraction of the circular ciliary muscle situated in the stroma of the ciliary body near the place of contact with the sclera. The tension of the ciliary muscle determines the shape of the crystalline lens. The ciliary body is the most vascularized part of the eye; it is supplied by blood vessels from the systemic circulation of the iris.

Inflammation of the ciliary body is called cyclitis; inflammation of both the ciliary body and the iris is called iridocyclitis.

REFERENCES

Stroeva, O. G. Morfogenez i vrozhdennye anomalii glaza mlekopitaiushchikh. Moscow, 1971.
Davson, H. The Physiology of the Eye, 3rd ed. Edinburgh-London, 1972.

O. G. STROEVA

References in periodicals archive ?
In this nonhuman primate EVD model, EBOV persisted in the vitreous humor, in cells attached to the retinal inner limiting membranes, and in the ciliary body, with a predilection for CD68+ macrophage/ monocytes, and with associated uveitis, retinitis, and vitritis (29).
In a previous study using 270[degrees] ciliary body ablation on 27 eyes, the cumulative probability of success of TS-CPC was 72% in the first and 52% in the second postoperative year based on success criteria similar to those used in the current study.
This may contribute to the thinning of the iris and ciliary body, thereby widening the anterior chamber angle and leading to a decreased outflow of aqueous humor; this would be expected to decrease IOP.
The specimens were then cut into 2 [micro]m sagittal sections and stained with hematoxylin and eosin to evaluate cellular infiltration in the iris and ciliary body.
Media tunica (incomplete) consists of three structures named iris, ciliary body and choroid, whose function is to provide nurture of the retina and deeper portions of the sclera, besides regulating the lens accommodation.
As previously described [16,17], anterior chamber tissues were scored for severity of inflammation as follows: grade 0 = normal tissue; grade 1+ = dilated iris vessels and thickened iris stroma with exudate, protein, and/or a few scattered inflammatory cells in the anterior chamber; grade 2+ = infiltration of inflammatory cells into the stroma of the iris and/or ciliary body with a moderate number of inflammatory cells within the anterior chamber; grade 3+ = heavy infiltration of inflammatory cells within the iris stroma, ciliary body, and the anterior chamber; and grade 4+ = heavy exudation of cells, dense protein aggregation in the anterior chamber, and in inflammatory cell deposits on the corneal endothelium.
Location of IOFBs were 1 (5.55%) in iris and ciliary body 1 (5.55%) in crystalline lens 10 (55.55%) in vitreous 4 (22.22%) embedded in retina 2 (11.11%) passed through the posterior wall of globe.
Uveitis is an inflammatory ocular disease of the uveal tract which is composed of the iris, choroid, and ciliary body. Uveitis can be caused by various factors including infectious or noninfectious (autoimmune) processes, often associated with systemic disease [8].
Three months after presentation, the bulge of the sclera was mimicking clinically a ciliary body tumor, namely, medulloepithelioma (Figure 2).
In the eye, immune complex deposits in the vascular endothelium of the conjunctiva, sclera, in the basement membrane of the ciliary body, cornea, along the peripheral nerves of the ciliary body, cornea and along the peripheral nerves of the ciliary body and conjunctiva.
Aqueous humor is produced by the ciliary body of the eye and it flows through the trabecular meshwork to ensure that the eye is firm so that it can function optically.
Medulloepithelioma is a rare congenital neuroepithelial tumor that arises from the nonpigmented ciliary epithelium of the ciliary body. Rarely, it can arise from the retina and optic nerve.