Structures

  • Piriformis
  • Obturator internus
  • Gemellus superior
  • Gemellus inferior
  • Quadratus femoris

MuscleActionOriginInsertionInnervationBlood supply
Piriformis- Lateral rotation of hip
- Assists abduction of hip when hip is flexed
- Anterior portion of lateral process of sacrum
- Gluteal surface of ilium at border of greater sciatic notch
- Superior border of greater trochanter- Piriformis nerve: L5,S1,S2- Superior and inferior gluteal arteries
- Internal pudendal artery
Obturator Internis- Lateral rotation of hip
- Assists abduction of hip when hip is flexed
- Internal surface of obturator membrane
- posterior bony margins of obturator foramen
- Medial surface of greater trochanter of femur- Nerve to the obturator internus and superior gemellus; L5,S1 (branch of the sacral plexus)- Internal pudendal artery
-Superior and inferior gluteal arteries
Gamellus superior- Lateral rotation of hip
- Assists abduction of hip when hip is flexed
- Ischial spine- Medial surface of greater trochanter of femur- Nerve to the obturator internus and superior gemellus; L5,S1 (branch of the sacral plexus)- Inferior gluteal artery
Gamellus inferior- Lateral rotation of hip
- Assists abduction of hip when hip is flexed
-Posterior ischial tuberosity
- Postero-lateral obturator ring
- Medial surface of greater trochanter of femur- Nerve to the obturator internus and inferior gemellus: L5,S1 (branch of the sacral plexus)- Inferior gluteal artery
Quadratus femoris- Lateral rotation of hip
- Assists adduction of hip
- Lateral margin of obturator ring (above ischial tuberosity)- Quadrate tubercle
- Intertrochanteric crest of proximal posterior femur
- Quadratus femoris branch of nerve to the quadratus femoris and inferior gemellus: L5, S1- Medial circumflex femoral artery
- Inferior gluteal artery
-1st - 4th perforating arteries
- obturator artery
- Superior muscular branches of popliteal artery