Common tendinous ring
Anulus tendineus communis
- Synonym: Common anular tendon
- Eponym: Anulus of Zinn
- Related terms: Common tendinous ring; Common anular tendon
Definition
The common tendinous ring is a fibrous ring that surrounds the upper, medial, and lower margins of the optic foramen and encircles the optic nerve. The ring is completed by a tendinous bridge prolonged over the lower and medial part of the superior orbital fissure and attached to a tubercle on the margin of the great wing of the sphenoid, bounding the fissure.
Fibrous ring that urrounds the upper, medial, and lower margins of the optic foramen and encircles the optic nerve. The ring is completed by a tendinous bridge prolonged over the lower and medial part of the superior orbital fissure and attached to a tubercle on the margin of the great wing of the sphenoid, bounding the fissure. Two specialized parts of this fibrous ring may be made out: a lower, the <b>ligament</b> or <b>tendon of Zinn,</b> which gives origin to the Rectus inferior, part of the Rectus internus, and the lower head of origin of the Rectus lateralis; and an upper, which gives origin to the Rectus superior, the rest of the Rectus medialis, and the upper head of the Rectus lateralis. </p>
Two specialized parts of this fibrous ring may be made out:
A lower, the ligament or tendon of Zinn, which gives origin to the Rectus inferior, part of the Rectus medialis, 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.
References
