Give the origin and insertion of gluteus medius and its main actions.

Give the origin and insertion of gluteus medius and its main actions.

• A. Origin: external surface of the ilium (between lines). Insertion: greater trochanter of the femur. Action: abducts the thigh and medially rotates; prevents pelvic drop during gait.
• B. Origin: anterior iliac crest. Insertion: IT band. Action: flexes hip.
• C. Origin: posterior ilium. Insertion: gluteal tuberosity. Action: extends thigh.
• D. Origin: inferior pubic ramus. Insertion: greater trochanter. Action: adducts thigh.

Answer: (A)