<prompt> Cremaster muscle is supplied byGenital branch of genitofemoral nerveIlioinguinal nerveIliohypogastric nerveFemoral nerve  <response>: Ans. a Genital branch of genito-femoral nerve. Ref. BD Chaurasia, Human Anatomy Vol. II 3rd ed. 172CREMASTER Cremaster Muscle consist of muscle fasciculi embedded in the cremasteric facia. Fasciculi form loop that are attached laterally to inguinal ligament medially to pubic tubercle, pubic crest, the conjoint lendon. It is fully developed only in male. It is supplied by Genital branch of the genitofemoral nereve LI. Its action is to suspend testis can elevate it. It also closes superficial inguinal ring by ball valve mechanism when intraabdominal pressure is raised. In UMN lesions above segment LI, Cremaster reflex is lost. 