sciatic foramen (greater/lesser)
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Introduction
The two foraminas formed by the sacrospinous & sacrotuberous ligaments crossing the sciatic notches of the hip bone.
- Greater sciatic foramen:
- passageway for structures entering or leaving the pelvis (e.g., sciatic nerve)
- in other words it is the door through which all lower limb arteries & nerves leave the pelvis & enter the gluteal region
- the piriformis enters the gluteal region through this foramen & almost fills it
- Lesser sciatic foramen:
- passageway for structures entering or leaving the perineum (e.g., pudendal nerve)