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Anterior surface of sacrum
Piriformis origin
Greater trochanter (through greater sciatic foramen)
Piriformis insertion
Hip external rotation
Hip abduction
Hip internal rotation with hip flexed above 90°
Piriformis actions
Nerve to piriformis
Piriformis innervation
Ischial spine
Gemellus superior origin
Greater trochanter via tendon of obturator internus
Gemellus superior insertion
Hip external rotation
Gemellus superior actions
Nerve to obturator internus
Gemellus superior innervations
Internal surface of obturator foramen and membrane
Obturator internus origin
Greater trochanter
Obturator internus insertion
Hip external rotation
Obturator internus action
Nerve to obturator internus
Obturator internus innervation
Origin: Ischial tuberosity
Insertion: Greater trochanter via tendon of obturator internus
Action: Hip external rotation
Innervation: Nerve to quadratus femoris
Gemellus inferior
OIAI
Origin:
Pubis and ischium near obturator foramen
External surface of obturator membrane
Insertion: Trochanteric fossa
Action: Hip external rotation
Innervation: Obturator
Obturator externus OIAI
Origin: Ischial tuberosity
Insertion: Quadrate tubercle
Action:
Hip external rotation
Hip adduction
Innervation: Nerve to quadratus femoris
Quadratus femoris OIAI