Which spinal roots innervate the iliopsoas muscle?

The iliopsoas muscle, which is comprised of the psoas major and iliacus muscles, is primarily innervated by the lumbar plexus, specifically through the nerve roots of L1, L2, and L3. This muscle plays a crucial role in hip flexion and is vital for various movements, including walking and running.

The innervation from L2 and L3 is particularly significant, as these roots contribute to the femoral nerve, which specifically innervates the iliacus muscle. The psoas major receives contributions from the L1 and L2 roots, highlighting the importance of these specific spinal levels in providing motor function to the iliopsoas muscle.

Understanding the correct spinal roots is essential for diagnosing and treating conditions related to hip flexor weakness or dysfunction, making this knowledge vital for practitioners in both clinical and rehabilitation settings.