Obturator Internus
Hip & Pelvis
Its tendon makes a sharp 90° turn around the ischium — like a rope over a pulley.
Function
Laterally rotates and abducts flexed hip
Origin
Internal surface of obturator membrane and surrounding bone
Insertion
Greater trochanter (medial surface)
Innervation
Nerve to obturator internus (L5-S2)