Annulus of Zinn
|Annulus of Zinn|
2 = superior, 3 = inferior, 4 = medial, 5 = lateral
Oblique muscles: 6 = superior, 8 = inferior
Other muscle: 9 = levator palpebrae superioris
Other structures: 1 = Annulus of Zinn, 7 = Trochlea, 10 = Superior tarsus, 11 = Sclera, 12 = Optic nerve
|Latin||annulus tendineus communis|
|Gray's||subject #227 1022|
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 annulus 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.
- "Basic Human Anatomy". Retrieved 12/08/2013.
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- Ko MK, Kim DS, Ahn YK (1999). "Morphological variations of the peripapillary circle of Zinn-Haller by flat section". Br J Ophthalmol 83 (7): 862–6. doi:10.1136/bjo.83.7.862. PMC 1723100. PMID 10381675.
- "eMedicine - Orbit Anatomy : Article by Guy J Petruzzelli". Archived from the original on 24 March 2008. Retrieved 2008-03-17.
- synd/3938 at Who Named It?
- J. G. Zinn. Descriptio anatomica oculi humani. Göttingen, B. Abrami Vandenhoeck, 1755.