annulus of Zinn


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annulus of Zinn

A ring of fibrous tissue behind the eye that surrounds the optic nerve and the ophthalmic artery and vein. It consists of the origins of five of the extraocular muscles: the superior oblique, and the inferior, lateral, medial, and superior rectus muscles.
Synonym: annular tendon
See also: Zinn, Johann

annulus of Zinn 

The common tendon from which arise the four recti muscles of the eye. It surrounds the optic foramen and a part of the medial end of the superior orbital fissure. Syn. tendon of Zinn. See muscle cone.
References in periodicals archive ?
Close to the apex of the orbit, the annulus of Zinn encircles the optic nerve and contains the origins of the four recti muscles.
The rest is held stable by the annulus of Zinn at one end and the 'muscle pulleys' at the other.
The upper part of the annulus of Zinn near the apex of the orbit