Final answer:
The lesser sciatic foramen is a pelvic opening formed by the lesser sciatic notch of the hip bone, the sacrospinous ligament, and the sacrotuberous ligament. It is one of two openings on the posterolateral sides of the pelvis through which muscles, nerves, and blood vessels for the lower limb exit.
Step-by-step explanation:
The lesser sciatic foramen is a pelvic opening formed by the lesser sciatic notch of the hip bone, the sacrospinous ligament, and the sacrotuberous ligament. It is one of two openings on the posterolateral sides of the pelvis through which muscles, nerves, and blood vessels for the lower limb exit. The smaller, more inferior lesser sciatic foramen is formed by the lesser sciatic notch of the hip bone, together with the sacrospinous and sacrotuberous ligaments.