The vastus intermedius is innervated by which nerve?

• A. Obturator Nerve
• B. Sciatic Nerve
• C. Superior Gluteal Nerve
• D. Femoral

Answer: (D)

Vastus intermedius is one of the quadriceps muscles, the group responsible for extending the knee. All quadriceps muscles, including vastus intermedius, receive motor input from the femoral nerve (L2–L4). That makes the femoral nerve the correct innervation.

The other nerves serve different regions: the obturator nerve mainly innervates thigh adductors; the sciatic nerve supplies the posterior thigh muscles (and ultimately the leg) via its branches; the superior gluteal nerve goes to the gluteal muscles. Since vastus intermedius is a anterior thigh muscle involved in knee extension, it aligns with innervation from the femoral nerve.