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Rectum versus anus

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The anus is connected to the rectum by the anal canal. The anal canal has two ring-shaped muscles called sphincter muscles that keep the anus closed and prevent stool from leaking out. The anal verge is where the canal connects to the outside skin at the anus. This skin around the anal verge is called the perianal skin previously called the anal margin. The inner lining of the anal canal is the mucosa.
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What Is Anal Cancer?

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What Is Anal Cancer?

Key Takeaway: Rectal cancer and anal cancer may often be confused due to the close proximity of the rectum and the anus; however, they are two distinct diseases with different risk factors and treatments. Fundamentally, the difference between anal cancer and rectal cancer has to do with the type of cells that grow rather than the location of the cancer. Anal cancer is a squamous cancer, or a cancer of the skin-like cells of the anal canal. Anal cancer can even occur in the rectum.
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Overview of the Anus and Rectum

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. Adults and older children can withstand this urge until they reach a bathroom. Infants and young children lack the muscle control necessary to delay bowel movement.
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The rectum is a muscular tube about 13 cm 5 in. The rectum connects the colon to the anus, which is the opening where stool exits the body. The internal and external anal sphincters are rings of muscle at the opening of the anus.
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