pubococcygeal muscles group with pubococcygeus, iliococcygeus outline diagram

anal anatomy anus biology body bone bones cavity concept description diagram diaphragm educational example explanation fascia group health healthcare hip iliococcygeus ilium illustration isolated lesser location medical medicine muscle muscles muscular obturator outline pelvic pelvis perineal physical physiology pubococcygeal pubococcygeus puborectalis scheme skeletal skeleton sphincter structure transverse vector viscera