Common tendinous ring: Structure and neurovasculature (English)

The common tendinous ring of Zinn is a fibrous tissue that serves as a common origin for the four rectus muscles. It encircles the inferolateral part of the superior orbital fissure and surrounds the superior branch of the oculomotor nerve (CN III), nasociliary nerve, abducens nerve (VI) and the inferior branch of the oculomotor nerve (CN III) as they pass through the superior orbital fissure.