annulus of Zinn


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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.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
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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
Extraocular muscles: anatomy and clinical investigation

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