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Annulus of Zinn
The annulus of Zinn, also known as the annular tendon, circle of Zinn-Haller or common tendinous ring, is a ring of fibrous tissue surrounding the optic nerve at its entrance at the apex of the orbit. It is the origin for five of the six extraocular muscles.
Additional recommended knowledge
Some older sources (such as Gray's Anatomy) distinguish between these terms more precisely, with the annulus tendineus communis being the parent structure, divided into two parts:
It should not be confused with the Zonule of Zinn, though it is named after the same person (Johann Gottfried Zinn).
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Annulus_of_Zinn". A list of authors is available in Wikipedia.|