Inferior gemellus muscle

The inferior gemellus muscle originates from the upper part of the ischial tuberosity and inserts into the medial surface of the greater trochanter of the femur, along with the tendon of the obturator internus muscle to form the common tendon of the Obturator internus and Gemelli.

Origin: Ischial tuberosity

Insertion: Obturator internus tendon

Nerve: Nerve to Quadratus femoris (L4, L5, S1)

Action: Rotates laterally thigh, helps stabilize the femoral head in the acetabulum during hip movements

Muscle group: Deep gluteal muscles; Lateral rotators of thigh; Short external rotators of the hip

Description: The Gemelli are two small muscular fasciculi, accessories to the tendon of the Obturator internus which is received into a groove between them. The Gemellus inferior arises from the upper part of the tuberosity of the ischium, immediately below the groove for the Obturator internus tendon. It blends with the lower part of the tendon of the Obturator internus, and is inserted with it it into the medial surface of the greater trochanter. Rarely absent.