The iliopsoas muscle is found within the iliopsoas compartment and is an important muscle in locomotion and upright posture.
- origin: fusion of psoas major and iliacus muscles
- insertion: lesser trochanter of the femur
- nerve supply: femoral nerve; lumbar plexus
- blood supply: iliolumbar artery; medial femoral circumflex artery
- action: flexor of the hip and trunk; lateral flexor of the trunk
The iliopsoas muscle has its origin at the fusion of the psoas major and iliacus muscles. This fusion occurs at the level of L5-S2, and the combined muscles pass from the pelvis to the thigh under the inguinal ligament.
The iliopsoas muscle inserts into the lesser trochanter of the femur via the psoas tendon.
- femoral nerve (iliacus part)
- direct branches of the lumbar plexus (psoas part)