Muscle Atlas

Quadratus Femoris

Origin: Lateral margin of obturator ring above ischial tuberosity
Insertion: Quadrate tubercle and adjacent bone of intertrochanteric crest of proximal posterior femur
Action: Rotates the hip laterally; also helps adduct the hip
Innervation: Quadratus femoris branch of nerve to the quadratus femoris and inferior gemellus (L5, S1)
Arterial Supply: Medial circumflex femoral artery, inferior gluteal artery, 1st - 4th perforating arteries, obturator artery, and some superior muscular branches of popliteal artery

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