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Annulus of Zinn
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Annulus of Zinn : ウィキペディア英語版
Annulus of Zinn

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 five of the seven extraocular muscles, omitting the inferior oblique muscle.〔(【引用サイトリンク】url=http://www.dartmouth.edu/~humananatomy/part_8/chapter_45.html )
It can be used to divide the regions of the superior orbital fissure.
The arteries surrounding the optic nerve are sometimes called the "circle of Zinn-Haller" ("CZH"). This vascular structure is also sometimes called "circle of Zinn".
==Parts==
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''.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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