Muscle Anatomy


The iliacus muscle is located in the pelvic region, forming part of the anterior compartment. It is a flat and triangular muscle that contributes to the overall musculature in the pelvic and hip areas.

Originating from the iliac fossa of the ilium and the inner surface of the anterior sacrum, the iliacus takes its starting point from the bony structures in the pelvic region.

The muscle inserts into the lesser trochanter of the femur, forming a connection with the proximal part of the thigh bone. This insertion site allows the iliacus to exert its influence on the hip joint.

Functionally, the iliacus is a potent hip flexor. It actively participates in bending the hip joint, lifting the thigh toward the torso. Additionally, the muscle contributes to the stabilization of the pelvis during various movements, playing a role in maintaining an upright posture. The iliacus works in conjunction with the psoas major to form the iliopsoas muscle, a primary flexor of the hip. The iliacus is crucial in activities like walking, running, and standing, showcasing its significance in hip and lower limb biomechanics.