What muscle assists in abducting the thigh and stabilizing the pelvis?

• A. Adductor longus
• B. Gluteus medius
• C. Iliopsoas
• D. Sartorius

Answer: (B)

The gluteus medius is a key muscle in the pelvis and thigh that is primarily responsible for abducting the thigh, which means it helps move the leg away from the midline of the body. Additionally, it plays a crucial role in stabilizing the pelvis during activities such as walking, running, or standing on one leg. This stabilization is important to maintain proper alignment and prevent the pelvis from tilting excessively when weight is placed on one side.

The gluteus medius is located on the lateral aspect of the hip, making it uniquely positioned to perform these functions effectively. Its anatomical structure, including its muscle fibers and attachment points, allows it to exert a significant force during thigh abduction while also contributing to pelvic stability.

In contrast, the other muscles listed do not primarily fulfill both functions of thigh abduction and pelvic stabilization to the same extent as the gluteus medius. The adductor longus mainly facilitates adduction of the thigh, while the iliopsoas is primarily involved in hip flexion. The sartorius can assist in hip flexion and abduction, but it is not as effective in stabilizing the pelvis as the gluteus medius is. Thus, the gluteus medius stands out as