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The defecation reflex is initiated by stretching of the wall of the rectum. This reflex facilitates expulsion of feces through the anus.
A pouch from the rectum is called a rectocele.
A pouch from the bladder is a cystocele.
It is the bulging of the rectum into the vaginal wall.
The rectum and sigmoid colon are uniformly thickened.
The 'wall of tissue' between the rectum and vagina.