Which nerve supplies the hamstrings and all muscles below the knee via its branches, enabling hip extension and knee flexion?

Which nerve supplies the hamstrings and all muscles below the knee via its branches, enabling hip extension and knee flexion?

• A. Femoral nerve
• B. Obturator nerve
• C. Sciatic nerve
• D. Radial nerve

Answer: (C)

The sciatic nerve is the main conduit for the hamstrings and all muscles below the knee through its branches. It arises from the lumbosacral plexus and travels down the posterior thigh, supplying the hamstrings. Near the knee it divides into the tibial nerve and the common fibular (peroneal) nerve, which continue to innervate everything below the knee. Because the hamstrings are innervated by the tibial portion of the sciatic nerve, these fibers enable knee flexion, and the nerve’s branches below the knee control motor function in the leg, supporting movements like hip extension and knee flexion. The other nerves don’t reach the hamstrings or the leg below the knee: the femoral nerve mainly innervates the anterior thigh, the obturator nerve the medial thigh, and the radial nerve serves the upper limb.

The sciatic nerve is the main conduit for the hamstrings and all muscles below the knee through its branches. It arises from the lumbosacral plexus and travels down the posterior thigh, supplying the hamstrings. Near the knee it divides into the tibial nerve and the common fibular (peroneal) nerve, which continue to innervate everything below the knee. Because the hamstrings are innervated by the tibial portion of the sciatic nerve, these fibers enable knee flexion, and the nerve’s branches below the knee control motor function in the leg, supporting movements like hip extension and knee flexion. The other nerves don’t reach the hamstrings or the leg below the knee: the femoral nerve mainly innervates the anterior thigh, the obturator nerve the medial thigh, and the radial nerve serves the upper limb.