The portion of the fibrous ring (annulus tendineus communis) from which the inferior rectus muscle of the eye originates.See also: Zinn, Johann
annulus of Zinn
The common tendon from which arise the four recti muscles of the eye. It surrounds the optic foramen and a part of the medial end of the superior orbital fissure. Syn. tendon of Zinn. Seemuscle cone.