AP BIOLOGY

Detailed explanation-1: -Relations. Obturator externus is located in the pelvis on the anterior aspect of the innominate bones. It covers the obturator foramen and is located deep to pectineus and superior parts of the adductors of the thigh. Its tendon lies deep to the quadratus femoris muscle and separates it from the neck of the femur.

Detailed explanation-2: -It is described as a muscle which originates from the external bony margin of the obturator foramen with a cylindrical tendon which passes like a sling under the femoral neck and inserts in the trochanteric fossa.

Detailed explanation-3: -Obturator externus externally rotates hip during neutral and flexion but not in hip extension. It may assist in the adduction of the hip joint during flexion.

Detailed explanation-4: -The obturator internus abducts the leg (moves the leg away from the body), while the obturator externus adducts the leg (moves the leg toward the body).