Common tendinous ring
Ring of fibrous tissue around optic nerve at its entrance to the eye / From Wikipedia, the free encyclopedia
The common tendinous ring, also known as the annulus of Zinn or annular tendon, is a ring of fibrous tissue surrounding the optic nerve at its entrance at the apex of the orbit. It is the common origin of the four recti muscles of the group of extraocular muscles.
Quick Facts Details, Identifiers ...
Common tendinous ring | |
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Details | |
Identifiers | |
Latin | anulus tendineus communis |
TA98 | A15.2.07.015 |
TA2 | 2047 |
FMA | 49071 |
Anatomical terminology |
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It can be used to divide the regions of the superior orbital fissure.[1]
The arteries surrounding the optic nerve form a vascular structure known as the circle of Zinn-Haller, or sometimes as the circle of Zinn.[2]
The following structures pass through the tendinous ring (superior to inferior):
- Superior division of the oculomotor nerve (CNIII)
- Nasociliary nerve (branch of ophthalmic nerve)
- Inferior division of the oculomotor nerve (CNIII)
- Abducens nerve (CNVI)
- Optic nerve