What nerve is located inferior to the adductor longus?

The femoral nerve is the correct answer because it runs posterior to the iliopsoas muscle and passes beneath the inguinal ligament to enter the thigh, positioning it inferior to the adductor longus muscle. The adductor longus is one of the primary muscles of the medial compartment of the thigh, and its location is a key landmark in anatomical relations. As the femoral nerve continues its path, it supplies motor fibers to the muscles of the anterior compartment of the thigh, including the quadriceps. Additionally, it provides sensory innervation to the skin of the anterior thigh and the medial side of the leg via the saphenous nerve, which is a branch of the femoral nerve.

In contrast to the femoral nerve, the other options have different anatomical pathways. The saphenous nerve is indeed a branch of the femoral nerve but lies more anteriorly and, importantly, is not located inferior to the adductor longus itself. The obturator nerve, which innervates the adductor muscles, runs medial to the adductor longus but would not be described as lying inferior to it. The pudendal nerve, on the other hand, primarily supplies the perineum and is not associated with the thigh's