Iliacus muscle

Iliacus muscle is a large, flat muscle in the human body that is located in the pelvis. It is one of the muscles that make up the hip flexors, and it plays a crucial role in the movement of the lower body. The iliacus muscle originates from the upper two-thirds of the iliac fossa, the inner surface of the hip bone, and from the region of the anterior inferior iliac spine. It joins with the psoas major muscle to form the iliopsoas, which is the primary hip flexor muscle group.

Anatomy

The iliacus muscle is a triangular muscle which fills the iliac fossa. It is bordered by the lateral lip of the iliac crest, the ventral side of the sacrum and the anterior side of the hip joint. The muscle fibers converge towards the lesser trochanter of the femur, where they insert. The iliacus muscle works in conjunction with the psoas major muscle to flex and externally rotate the hip joint.

Function

The primary function of the iliacus muscle is to flex the thigh at the hip joint. This action is important for walking, running, and jumping. The muscle also helps to stabilize the hip joint and maintain proper posture.

Clinical significance

Injury or strain to the iliacus muscle can result in iliacus syndrome, a condition characterized by pain in the groin and lower back. This condition can be caused by overuse, trauma, or a sedentary lifestyle. Treatment typically involves physical therapy, pain management, and in some cases, surgery.

See also

• Psoas major muscle
• Hip flexors
• Iliacus syndrome

References

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