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 ?
32 mm in size, was raised with distinct borders and a smooth anterior surface, was solid and heterogeneous (with a vascular component), and extended to the ciliary body.
D J Apple et al (1985) [10] compared indications, advantages and disadvantages of ciliary sulcus and capsular fixation of PC IOL.
Although IONs embrace a variety of causal pathways from embolic occlusion of short posterior ciliary arteries to severe systemic hypotension, the etiologies of the 2 most commonly diagnosed forms of anterior ION--common and giant cell arteritis--are unknown.
The tumor was diagnosed as adenoma of the pigmented ciliary epithelium.
Eyes absent, no nuchal organs, no so-called statocysts dorso-anteriorly; salivary glands inconspicuous; thick, double-circular band of cilia around mouth, which continues as a ventral ciliary band to the last segment, male paired, separated lateral organs in segments 6-11.
Primary ciliary dyskinesia (PCD) is a rare genetic disorder involving number of human organs like upper and lower respiratory tract, spermatozoa in male and fallopian tube in females.
In Kartagener syndrome sinusitis, bronchiectasis, and male infertility are attributed to abnormal ciliary motility.
The ciliature of the ventral surface of the body composed of two ciliary systems; the right and the left ciliary kineties separated by a non-ciliary zone (Figs.
18) Recently, it has been shown that CNTF supports the survival of both cultured ciliary neurons from eight day old chick embryos, purified spinal motor neurons from six day old chick embryos and also spinal motor neurons when applied daily onto the chorioallantoic membrane of chick embryos.
elegans, social cell biology in microbe communities and Drosophila tumors, the Drosphila digestive tract, bacterial Mg2+ transport, SIR proteins, silent chromatin, prions, ciliary proteins, genetic techniques for archaea, nuclear control, and DNA repair.
Zhao Bingkun, an ophthalmologist in Zhejiang province, said long hours staring at bright screen in the dark can cause the ciliary muscle to over contract, affecting its ability to accommodate the changes in the lens when viewing objects at varying distances.
Martignetti and Adel Shalata, of the Ziv Medical Center Safed, Israel, and their team analysed a large Israeli Arab family affected by autosomal-recessive morbid obesity and identified a truncating mutation in the gene that recently was found to encode CEP19, a ciliary protein.