Rectum anal

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The final segment of the rectum, the ampulla , relaxes to accumulate and temporarily store faeces until defecation occurs. It is continuous with the anal canal; which passes through the pelvic floor to end as the anus. In the superior third of the rectum, the anterior surface and lateral sides are covered by peritoneum. In females, the peritoneum reflects to the posterior vagina and cervix, forming the rectouterine pouch pouch of Douglas. Fig 2 — The peritoneal reflections of the rectum in males A and females B. The rectum is located within the pelvic cavity , and is the most posterior of the pelvic viscera.
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The Rectum

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Rectal cancer - Symptoms and causes - Mayo Clinic

The rectum is the last several inches of the large intestine. Rectal cancer starts in the lining of the rectum rectal mucosa. Rectal cancer is cancer that begins in the rectum. It starts at the end of the final segment of your colon and ends when it reaches the short, narrow passage leading to the anus. Cancer inside the rectum rectal cancer and cancer inside the colon colon cancer are often referred to together as "colorectal cancer.
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Rectum, Anus, and Anal Sphincter

The anus is the opening at the end of the digestive tract where stool leaves the body. The rectum is the section of the digestive tract above the anus where stool is held before it passes out of the body through the anus. The anus is formed partly from the surface layers of the body, including the skin, and partly from the intestine. The rectal lining consists of glistening red tissue containing mucus glands—much like the rest of the intestinal lining. The lining of the rectum is relatively insensitive to pain, but the nerves from the anus and nearby external skin are very sensitive to pain.
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The rectum is a chamber that begins at the end of the large intestine, immediately following the sigmoid colon, and ends at the anus see also Overview of the Anus and Rectum. Ordinarily, the rectum is empty because stool is stored higher in the descending colon. Eventually, the descending colon becomes full, and stool passes into the rectum, causing an urge to move the bowels defecate.
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