Which nerve provides innervation to the adductor magnus (adductor part)?

Which nerve provides innervation to the adductor magnus (adductor part)?

• A. Anterior division obturator nerve
• B. Posterior division obturator nerve
• C. Femoral nerve
• D. Tibial nerve

Answer: (B)

The adductor magnus has two parts with different nerve supplies. The part that functions as the true adductor is innervated by the posterior division of the obturator nerve. This division carries L2–L4 fibers that target the medial thigh’s adductor muscles, including the adductor magnus’ adductor portion. The femoral nerve mainly supplies the anterior thigh muscles and does not reach this part of the adductor magnus. The tibial nerve (from the sciatic nerve) supplies the hamstring portion of the adductor magnus, not the adductor part. The anterior division of the obturator nerve supplies other medial thigh muscles such as adductor longus, adductor brevis, and gracilis, but not the adductor part of adductor magnus.

The adductor magnus has two parts with different nerve supplies. The part that functions as the true adductor is innervated by the posterior division of the obturator nerve. This division carries L2–L4 fibers that target the medial thigh’s adductor muscles, including the adductor magnus’ adductor portion. The femoral nerve mainly supplies the anterior thigh muscles and does not reach this part of the adductor magnus. The tibial nerve (from the sciatic nerve) supplies the hamstring portion of the adductor magnus, not the adductor part. The anterior division of the obturator nerve supplies other medial thigh muscles such as adductor longus, adductor brevis, and gracilis, but not the adductor part of adductor magnus.