Ciliary Body

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ciliary body

[¦sil·ē‚er·ē ¦bäd·ē]
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.


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


References in periodicals archive ?
Medulloepitheliomas are considered congenital tumors of the nonpigmented ciliary epithelium.
The results indicate RPL554 may increase mucociliary clearance through stimulation of CFTR and increasing ciliary beat frequency and thus could provide a novel therapeutic option for CF.
Grade 4 (35-45 degrees): the widest angle (characteristic of myopia and aphakia) in which the ciliary body can still be visualised with ease.
Additionally, rhabdomyosarcoma, a small round blue cell tumor, has been reported to arise in a ciliary body medulloepithelioma.
The primary ciliary dyskinesia also affects spermatozoa, flagella, rendering males sterile.
The ECT intraocular implant is a small device--the size of a grain of rice--containing cells that provide sustained delivery of a vision-preserving protein known as ciliary neurotrophic factor, which is delivered directly to the back of the eye in a controlled, continuous basis, thus bypassing the blood-retinal barrier and overcoming a major obstacle in the treatment of retinal disease.
Long hours of VDT use may affect performance of a structure known as the ciliary body of the eye, which controls lens refraction.
I have learned of primary ciliary dyskinesia and situs inversus, where the abdominal and thoracic organs are in a reversed position, in a young dog in Belgium.
Other laser therapies target the colored area of the eye or the ciliary body that produces eye fluid (see picture above).
A ciliary mechanism is employed to helop move the restiform body.
Vertebrates use ciliary opsin in photoreceptor cells, whereas invertebrates use rhabdomeric opsin.