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DictionarySeezonuleCiliary Zonule
Ciliary Zonule (also zonule of Zinn), in terrestrial vertebrates, including humans, a round ligament supporting the crystalline lens. The ciliary zonule was first described in 1755 by the German scientist J. Zinn. It consists of dense glycoprotein fibers attached to the basal membrane of the ciliary folds and to the equator of the lens capsule. The fibers of the ciliary zonule are covered by a mucopolysaccharide gel. The gel fills the spaces between the fibers and protects the fibers from the proteolytic enzymes of the anterior chamber of the eye. The gel imparts a membranous appearance to the anterior and posterior surfaces of the ciliary zonule. Tightening or loosening the ciliary zonule by contraction of the ciliary muscle alters the curvature of the lens and thereby effects accommodation. ciliary zonule
zonule [zōn´ūl] a small zone.ciliary zonule (zonule of Zinn) a series of fibers connecting the ciliary body and lens of the eye, holding the lens in place. Ciliary zonule. The system of suspensory ligaments holding the lens in position. From Dorland's, 2000.cil·i·ar·y zon·ule [TA] a series of delicate meridional fibers arising from the inner surface of the orbiculus ciliaris that run in bundles between, and in a thin layer over, the ciliary processes; at the inner border of the corona, the fibers diverge into two groups that are attached to the capsule on the anterior and posterior surfaces of the lens close to the equator; the spaces between these two layers of fibers are filled with aqueous humor. Synonym(s): Zinn zonule [TA], zonula ciliaris [TA], apparatus suspensorius lentis, suspensory ligament of lenscil·i·ar·y zo·nule (sil'ē-ar-ē zōn'yūl) [TA] A series of delicate meridional fibers arising from the inner surface of the orbiculus ciliaris that run in bundles between, and in a very thin layer over, the ciliary processes; at the inner border of the corona, the fibers diverge into two groups that are attached to the capsule on the anterior and posterior surfaces of the lens close to the equator; the spaces between these two layers of fibers are filled with aqueous humor.
Synonym(s): zonula ciliaris [TA] , suspensory ligament of lens, Zinn zonule. Zinn, Johann Gottfried, German anatomist, 1727-1759. Zinn artery - Synonym(s): central artery of retinaZinn corona - Synonym(s): Zinn vascular circleZinn ligament - Synonym(s): Zinn ringZinn membrane - the anterior layer of the iris.Zinn ring - a fibrous ring that surrounds the optic canal and the medial part of the superior orbital fissure. Synonym(s): common tendinous ring; Zinn ligament; Zinn tendonZinn tendon - Synonym(s): Zinn ringZinn vascular circle - a network of branches of the short ciliary arteries on the sclera around the point of entrance of the optic nerve. Synonym(s): vascular circle of optic nerve; Zinn coronaZinn zonule - a series of delicate meridional fibers arising from the inner surface of the orbiculus ciliaris and that run in bundles between and in a very thin layer over the ciliary processes. Synonym(s): ciliary zonule |