Pubococcygeus muscle -the puborectalis, pubococcygeus, and iliococcygeus comprise the levator ani, the main muscular component of the pelvic floor. the pubococcygeus is the part of the levator ani most frequently damaged during parturition. because the pubococcygeus surrounds and supports the neck of the bladder and the proximal urethra, urinary leakage is a common result, particularly during increased abdominopelvic pressure, e.g., during coughing. damage to the puborectalis would result in fecal incontinence under similar situations. both the obturator internus muscle and the piriformis are parts of the lateral wall of the pelvis and assist in lateral rotation of the thigh.