Which nerve has spinal levels L3, L4 and mainly innervates medial thigh adductors?

Which nerve has spinal levels L3, L4 and mainly innervates medial thigh adductors?

• A. Lumbosacral trunk
• B. Accessory obturator nerve
• C. Genitofemoral nerve
• D. Obturator nerve

Answer: (B)

Medial thigh adductors are mainly supplied by the obturator nerve, which carries fibers from L2 to L4 and travels through the obturator canal to reach the adductor group (adductor longus, adductor brevis, adductor magnus part, gracilis, and obturator externus). This nerve’s root level aligns with L3–L4, making it the primary source for thigh adduction. The accessory obturator nerve is a known anatomical variant that also originates from L3–L4, and it can contribute to the adductors in some individuals, but it is not the principal nerve for these muscles in most people. The other options come from different sources or plexuses and do not predominantly innervate the medial thigh adductors.

Medial thigh adductors are mainly supplied by the obturator nerve, which carries fibers from L2 to L4 and travels through the obturator canal to reach the adductor group (adductor longus, adductor brevis, adductor magnus part, gracilis, and obturator externus). This nerve’s root level aligns with L3–L4, making it the primary source for thigh adduction. The accessory obturator nerve is a known anatomical variant that also originates from L3–L4, and it can contribute to the adductors in some individuals, but it is not the principal nerve for these muscles in most people. The other options come from different sources or plexuses and do not predominantly innervate the medial thigh adductors.