The sciatic nerve then passes beneath the piriformis muscle, and through the greater sciatic foramen, which is an opening formed by the pelvic bone, sacrospinous and sacrotuberous ligaments.

随后，坐骨神从下方过梨状肌，并过坐骨大孔；坐骨大孔是由骨盆、骶棘骶结节共同围成的通道。