The saphenous nerve is a terminal branch of the femoral nerve and functions as a pure sensory nerve, providing cutaneous innervation to the medial knee, leg, ankle, and foot. It originates from the posterior division of the femoral nerve in the femoral triangle, lateral to the femoral artery and vein. Exiting the femoral triangle, it enters the adductor canal and travels inferiorly with the femoral artery and vein. The saphenous nerve then exits the canal, just superior to the knee, travels superficially, and gives off its first branch, the infrapatellar branch, which travels through the inferior portion of the sartorius muscle and provides sensory innervation to the skin of the inferomedial knee.