Identify and clean the obturator internus tendon and the superior gemellus, inferior gemellus and quadratus femoris muscles. (G 6.32A;N 482;Gl 31.14B)

1. There may be a slippery, membranous structure overlying the four muscles. This is the gluteal bursa. Remove this bursa.
2. It may be difficult to distinguish the gemelli muscles and the tendon of the obturator internus muscle as they emerge inferior to the piriformis muscle. It may be helpful to medially rotate the femur by rotating the cadaver's foot. This will remove the slack from these structures.
3. On one side only, cut the quadratus femoris muscle from its femoral attachment. Reflect the quadratus femoris to expose the tendon of the obturator externus muscle. The vessels deep to the quadratus femoris muscle are branches of the medial circumflex femoral artery and vein.