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Your is the section of your large intestine that comes just before your anus. It’s about five or six inches long. This is the reservoir where poop collects before it’s ready to come out. When your rectum is full, trigger the urge to have a bowel movement, and your internal anal sphincter relaxes automatically. Your external sphincter is under your conscious control to activate when you’re ready.
The upper and lower parts of your anus (above and below the pectinate line) have different vascular supply and nerve supply. This is why your anus is much more sensitive to pain and other sensations below the line (in the lower two-thirds). Your internal and external anal sphincters also have a different nerve supply, which is why the inner one is involuntary (out of your control) and the outer one is under voluntary control.
The procedure is called an . While you’re asleep under sedation, a makes a small cut into your anal sphincter muscle to release tension permanently. After you wake up, you can go home the same day.
The anus is that part of the intestinal tract that passes through the muscular canal of the pelvis and anal sphincters. It is the final orifice through which stool passes out of the body. In adults, the anus is 4 to 5 centimeters long. The lower half of the anal canal has sensitive nerve endings. There are blood vessels under the lining, and in its mid portion there are numerous tiny, anal glands. This article describes four disorders that cause anal pain and irritation:
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