Dictionary.net

Proceeds from the lumbar plexus, and is situate at the outer side of the psoas muscle and crural artery. After it has passed under the crural arch, it divides into cutaneous and muscular branches. One of the branches, which is larger than the rest, is called the Saphaena nerve. It gives off filaments to the integuments of the knee, to the inner part of the leg, and to the dorsal surface of the foot. The remainder of the branches of the crural are distributed to the anterior and inner part of the thigh. The Accessory of the Crural Nerve is a term given to the 4th and 5th pairs of lumbar nerves.