The internal iliac artery divides into many smaller branches to supply the various pelvic muscles and tissue structures, as well as the gluteal muscles (buttocks) and the external genitalia. Some of the important branches of this vessel include: (1) iliolumbar artery to the ilium (hipbone) and muscles of the back; (2) superior and inferior gluteal arteries to the muscles of the buttocks, pelvic muscles, Continue Scrolling To Read More Below...