The Genitofemoral nerve innervates the cremaster muscle and provides general sensation to the intermediate one third of the subinguinal area. The genitofemoral nerve represents the efferent arm of the cremasteric reflex; the afferent arm is the ilioinguinal nerve. The iliohypogastric, ilioinguinal, and genitofemoral nerves may arise separately or in combination one with another. The iliohypogastric and ilioinguinal nerves emerge at the lateral margin of the psoas major muscle. These nerves lie on the quadratus lumborum and transversus abdominis muscles and course along the iliac crest. The genitofemoral nerve pierces the anterior aspect of the psoas major muscle and continues a course to the intermediate one third of the subinguinal area and the cremaster muscle.