Gemellus inferior

A small muscle located in the gluteal region, playing a vital role in hip movements.

Gemellus inferior is a muscle situated in the posterior part of the pelvis. It originates from the ischial tuberosity and inserts into the greater trochanter of the femur. This muscle is part of the deep hip muscles that are crucial for the stabilization and movement of the hip joint.

Terminologia Anatomica

gemellus-inferior

System

Muscular system

Function

The primary function of the gemellus inferior is to assist in the lateral rotation of the thigh at the hip joint. This action is essential during activities such as walking, running, and climbing, allowing for a wider range of motion and increased stability of the leg. Moreover, it works in conjunction with other deep hip muscles, including the obturator internus and superior gemellus, to provide support and stabilization to the hip. By facilitating movements that involve bending and rotating the leg, the gemellus inferior is integral to maintaining posture and balance during dynamic activities.

Location

Located in the gluteal region, the gemellus inferior is positioned beneath the gluteus maximus and above the quadratus femoris. Specifically, it can be found posteriorly on the pelvis, where it arises from the ischial tuberosity, which is the bony prominence on the lower part of the pelvic bone. From its origin, it courses laterally to insert into the greater trochanter of the femur, which is the prominent bony projection on the upper part of the thigh bone. This unique positioning allows it to effectively influence hip movements and play a key role in the dynamic functioning of the lower limb.

Did You Know?

The gemellus inferior works with the gemellus superior to create a stabilization effect on the hip joint during movement.
Like many of the smaller muscles in the pelvis, the gemellus inferior contributes to the overall strength and functionality of the hip region despite its small size.
Injuries or dysfunction in the gemellus inferior can contribute to hip pain or instability, affecting mobility.