Rectum and anus

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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Rectum and Anus

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Anatomy and Embryology of the Colon, Rectum, and Anus | SpringerLink

Many Americans have difficulty moving their bowels. Many things contribute to this problem, including diet and activity level. Other causes are unknown. The large bowel consists of the colon 5 feet long and the rectum 8 inches long. Many times the rectum is referred to as the opening where stool emerges, but that is actually the anus. The rectum is just upstream from the anus, and the large bowel is connected to the small bowel.
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The colon and rectum

The rectum is the final straight portion of the large intestine in humans and some other mammals , and the gut in others. The adult human rectum is about 12 centimetres 4. It terminates at the level of the anorectal ring the level of the puborectalis sling or the dentate line , again depending upon which definition is used. The word rectum comes from the Latin rectum intestinum , meaning straight intestine. The rectum is a part of the lower gastrointestinal tract.
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Although much of our fundamental understanding of the anatomy of the colon, rectum, and anus comes from the efforts of researchers of the 19th and early 20th centuries, comprehensive observations of this region had been made as early as by Andreas Vesalius through anatomic dissections. However, anatomy of this region, especially that of the rectum and anal canal, is so intrinsically related to its physiology that much can be appreciated only in the living. Thus, it is a region in which the surgeon has an advantage over the anatomist through in vivo dissection, physiologic investigation, and endoscopic examination.
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