Annulus of Zinn
Annulus of Zinn
The Annulus of Zinn (pronounced: /ˈæn.jʊ.ləs ɒv ˈzɪn/), also known as the Common Tendinous Ring, is a ring of fibrous tissue surrounding the optic nerve at the point of its entrance into the orbit. It is named after the German anatomist, Johann Gottfried Zinn.
Etymology
The term "Annulus of Zinn" is derived from the Latin word "annulus" meaning "ring", and "Zinn", the surname of the German anatomist Johann Gottfried Zinn who first described it.
Structure
The Annulus of Zinn is a circular band of connective tissue that forms the origin for four of the six extraocular muscles: the superior rectus, inferior rectus, medial rectus, and lateral rectus. It also provides origin to the superior oblique and inferior oblique muscles.
Function
The primary function of the Annulus of Zinn is to serve as a point of origin for the extraocular muscles, which control the movements of the eye. These muscles allow the eye to move up, down, left, and right, as well as to rotate.
Related Terms
- Optic Nerve: The nerve that transmits visual information from the retina to the brain.
- Extraocular Muscles: The muscles that control eye movement.
- Orbit: The bony cavity containing the eyeball.
- Johann Gottfried Zinn: The German anatomist who first described the Annulus of Zinn.
External links
- Medical encyclopedia article on Annulus of Zinn
- Wikipedia's article - Annulus of Zinn
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