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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.
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).
Annulus of Zinn
| | Name | PAGENAME | | Latin | annulus tendineus communis | | Graysubject | 227 | | Graypage | 1022 | | image |  | | Caption | Rectus muscles:
2 = Superior rectus muscl... | | Superior]], 3 | Inferior rectus muscle | | Inferior]], 4 | Medial rectus muscle | | Medial]], 5 | Lateral rectus muscle | Lateral]]
''oblique Mu... | Superior oblique muscle | | Superior]], 8 | Inferior oblique muscle | Inferior]]
''other Mus... | levator palpebrae superioris muscle | | Levator Palpebrae Superio... | Annulus of Zinn, 7 = Trochlea of superior obl... | | Trochlea]], 10 | Tarsi | | Superior Tarsus]], 11 | Sclera, 12 = Optic nerve | | Dorlandspre | a_50 | | Dorlandssuf | 12143789 |
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