Which muscle extends the hip via its posterior fibers?

Which muscle extends the hip via its posterior fibers?

• A. Posterior Fibers of Adductor Magnus
• B. Semimembranosus
• C. Gluteus Maximus Lower Fibers
• D. Biceps Femoris

Answer: (A)

Extending the hip is about pulling the thigh backward, and the direction of the pull matters. The adductor magnus has two parts: an anterior (adductor) part and a posterior (hamstring) part. The posterior fibers form the hamstring portion that attaches from the ischial area and inserts to the femur, so when these fibers contract they actively extend the hip. This specific posterior component is what makes this muscle uniquely capable of hip extension via its posterior fibers. Other muscles can extend the hip as well, but they do so through different parts or through the muscle as a whole rather than through a clearly defined posterior fiber portion.

Extending the hip is about pulling the thigh backward, and the direction of the pull matters. The adductor magnus has two parts: an anterior (adductor) part and a posterior (hamstring) part. The posterior fibers form the hamstring portion that attaches from the ischial area and inserts to the femur, so when these fibers contract they actively extend the hip. This specific posterior component is what makes this muscle uniquely capable of hip extension via its posterior fibers.

Other muscles can extend the hip as well, but they do so through different parts or through the muscle as a whole rather than through a clearly defined posterior fiber portion.