Which nerve root is associated with hip flexion of the anterior thigh?

Which nerve root is associated with hip flexion of the anterior thigh?

• A. L2
• B. L1
• C. L3
• D. L4

Answer: (A)

Hip flexion of the anterior thigh is dominated by the iliopsoas group, whose motor supply comes mainly from the L2 nerve root (via direct branches to psoas major and via the femoral nerve to iliacus). Since L2 is the primary root contributing to this action in the anterior thigh, it best corresponds to hip flexion. L1 has some proximity to hip motion but is less directly involved here, while L3-L4 are more related to knee extension via the quadriceps. Thus, the L2 root is the strongest single correlate for this movement.

Hip flexion of the anterior thigh is dominated by the iliopsoas group, whose motor supply comes mainly from the L2 nerve root (via direct branches to psoas major and via the femoral nerve to iliacus). Since L2 is the primary root contributing to this action in the anterior thigh, it best corresponds to hip flexion. L1 has some proximity to hip motion but is less directly involved here, while L3-L4 are more related to knee extension via the quadriceps. Thus, the L2 root is the strongest single correlate for this movement.