The sacrotuberous ligament converts the greater sciatic notch region and forms the posterior wall of a fibro-osseous canal through which one structure leaves the pelvis. Which structure passes between the sacrotuberous and sacrospinous ligaments to reach the perineum?

• A Superior gluteal vessels
• B Sciatic nerve
• C Nerve to obturator internus
• D Pudendal nerve and internal pudendal vessels ✓

Explanation

After exiting the greater sciatic foramen below piriformis, the pudendal nerve and internal pudendal vessels hook around the ischial spine and re-enter the pelvis through the lesser sciatic foramen, running between the sacrotuberous and sacrospinous ligaments within Alcock's pudendal canal. The sciatic nerve and superior gluteal vessels leave through the greater foramen and never enter the lesser foramen.

Reference: Gray's Anatomy for Students, 4th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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