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Common tendinous ring

From Biology-Online Dictionary
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Common tendinous ring

a fibrous ring that surrounds the optic canal and the medial part of the superior orbital fissure; it gives origin to the four rectus muscles of the eye and is partially fused with the sheath of the optic nerve.

Synonym: annulus tendineus communis, Zinn's ligament, Zinn's ring, Zinn's tendon.