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Anal canal
- Small & Large Intestine (National Cancer Institute)Anatomy/Images ... Anatomy ... National Cancer Institute ... From the National Institutes of Health
- ... sphincter, and external hemorrhoids occur below, outside the anal canal.
- ... below the urethral opening, and just above the anal opening. The urethral opening, through which urine passes, leads to the bladder. The anus leads to the rectum. The vaginal opening leads to the vaginal canal, which leads to the uterus.