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The iliopsoas muscle (silent "p") is a hip flexor that originates on our lumbar vertebrae and attaches to the femur. It is composed of the iliacus muscle and the psoas muscles. Tightness of this muscle can cause lower back pain.
Action: Flex hip
Innervation: L2-L4
Origin: Iliac fossa, lumbar spine
Insertion: Lesser trochanter of femur
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