Which nerve root level primarily mediates hip flexion of the anterior thigh?

Which nerve root level primarily mediates hip flexion of the anterior thigh?

• A. L2
• B. L3
• C. L1
• D. L4

Answer: (A)

Hip flexion of the anterior thigh is mainly driven by the iliopsoas complex. The psoas major gets its motor input from L1–L3, while the iliacus is supplied by the femoral nerve (L2–L4). Among these, the L2 root provides the strongest contribution to initiating hip flexion, with L3 supporting it as well. L1 contributes less, and L4 is more associated with knee extension via the femoral nerve. So the nerve root level most responsible for hip flexion is L2.

Hip flexion of the anterior thigh is mainly driven by the iliopsoas complex. The psoas major gets its motor input from L1–L3, while the iliacus is supplied by the femoral nerve (L2–L4). Among these, the L2 root provides the strongest contribution to initiating hip flexion, with L3 supporting it as well. L1 contributes less, and L4 is more associated with knee extension via the femoral nerve. So the nerve root level most responsible for hip flexion is L2.