system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 57-year-old woman comes to the physician because of several years of recurrent pelvic pain and constipation. She has increased fecal urgency and a sensation of incomplete evacuation following defecation. She has had no problems associated with urination. Her last menstrual period was 6 years ago. She has had three uncomplicated vaginal deliveries. Physical examination shows normal external genitalia. Speculum examination of the vagina and the cervix shows bulging of the posterior vaginal wall during Valsalva maneuver. Weakness of which of the following structures is the most likely cause of this patient's symptoms?
assistant
Rectovaginal fascia