Final answer:
The sacrospinous and sacrotuberous ligaments are found in the pelvis and contribute to the formation of the greater and lesser sciatic foramens. These ligaments help muscles, nerves, and blood vessels exit the pelvis and serve the lower limb.
Step-by-step explanation:
The sacrospinous and sacrotuberous ligaments are found in the pelvis. The sacrospinous ligament spans from the sacrum to the ischial spine, while the sacrotuberous ligament spans from the sacrum to the ischial tuberosity. These ligaments contribute to the formation of the greater and lesser sciatic foramens, which are openings for muscles, nerves, and blood vessels to exit the pelvis and serve the lower limb.