foramen

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Related to Greater sciatic foramen: obturator foramen, Piriformis, pudendal nerve, Greater sciatic notch
See: loophole
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In the sacral plexus, entrapment of the sciatic nerve at the greater sciatic foramen (piriformis syndrome) may be secondary to asymmetry of the piriformis muscle size or anatomic variations in the course of the sciatic nerve relative to the piriformis muscle (Figure Obtaining a sequence perpendicular to the piriformis muscle is crucial in identification of these anatomic variants.
It descends posteriorly to the superior margin of the greater sciatic foramen where it divides into an anterior trunk and a posterior trunk.
The sciatic nerve exits the greater sciatic foramen deep along the inferior surface of the piriformis muscle in 96% of the population.
It is passing out of the pelvis via the greater sciatic foramen.

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