Gemellus Superior and Inferior Muscles: Key Players in Hip Movement
The gemellus superior and gemellus inferior muscles, located in the human leg, play crucial roles in hip movement. They are positioned parallel to the obturator internus muscle in the gluteal region and help to steady the femoral head in the acetabulum. Both muscles originate from different parts of the pelvis and insert on the middle of the greater trochanter of the femur. The gemellus superior emerges from the spine of the ischium and is innervated by the nerve to the obturator internus muscle. It is usually smaller than its counterpart, the gemellus inferior, which emerges from the ischial tuberosity and is supplied by a branch of the nerve to the quadratus femoris. These muscles work together to laterally rotate the extended thigh and abduct the flexed thigh at the hip. Their actions contribute to the stability and mobility of the hip joint. The gemellus superior and gemellus inferior muscles, despite their distinct origins and innervations, collaborate to support the femoral head and facilitate hip movements. Their roles are vital for proper leg function and overall mobility.
