Ans. a. Pubococcygeus When the pubococcygeus muscle contracts, it pulls the rectum, vagina, and urethra anteriorly toward the pubic bone and constricts the lumens of these pelvic organs. It is this contractile propey that is so impoant in maintaining urinary and fecal continence and in providing suppo for the genital organs (vagina, cervix, uterus) that lie upon and are suppoed by the levator plate. Injury to pubococcygeus can lead to rectocele, cystocele and urinary incontinence.