Which of the following structures passes through the superior orbital fissure OUTSIDE the common tendinous ring of Zinn?

• A Superior ophthalmic vein ✓
• B Nasociliary nerve
• C Abducent nerve
• D Lower division of oculomotor nerve

Explanation

Within the ring pass the superior and lower divisions of the oculomotor nerve, the nasociliary nerve, and the abducent nerve. Outside the ring, through the wider lateral part of the fissure, run the trochlear nerve, frontal and lacrimal branches of V1, and the superior ophthalmic vein. This arrangement matters clinically: cavernous sinus thrombosis or orbital apex lesions spare or involve these structures differently, helping localize whether pathology sits inside or outside the tendinous ring.

Reference: Snell Clinical Anatomy by Regions, 10th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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