Annulus of Zinn
|Annulus of Zinn|
|Latin||Anulus tendineus communis|
The annulus of Zinn, also known as the annular tendon 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 four of the six extraocular muscles, omitting the inferior oblique muscle and superior oblique muscle.
Some sources distinguish between these terms more precisely, with the anulus tendineus communis being the parent structure, divided into two parts:
- a lower, the ligament or tendon of Zinn, which gives origin to the Rectus inferior, part of the Rectus internus, and the lower head of origin of the Rectus lateralis.
- an upper, which gives origin to the Rectus superior, the rest of the Rectus medialis, and the upper head of the Rectus lateralis. This upper band is sometimes termed the superior tendon of Lockwood.
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- J. G. Zinn. Descriptio anatomica oculi humani. Göttingen, B. Abrami Vandenhoeck, 1755.