Nicotine addiction explained — and how medications can help. 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.
Anal Fistula | Cedars-Sinai
An anal fistula is usually caused by an infection near your back passage anus that causes a collection of pus abscess in the nearby tissue. When the pus drains away, it can leave a small channel fistula behind. An anal fistula may also be associated with certain long-term bowel conditions. An anal fistula is a small channel that develops between the end of the bowel and the skin near your back-passage anus. Most anal fistulas develop after an anal abscess. Just inside your back passage anus , there are a number of glands that make a fluid substance.
Anorectal sepsis is common with over 10, admissions per year in the UK. This usually presents with either an abscess in the region of the anus, or a chronic anal fistula. It is thought anorectal sepsis originates from the anal glands. These glands are located on the dentate line the junction between the rectum and anus , and they become blocked with debris which in turn leads to bacterial overgrowth and formation of an abscess cryptoglandular theory. From this point the pus then tracks and spreads along potential planes and spaces, and the type of abscess that forms is dependent on its anatomy and relation to the sphincter complex of the anus.
Back to Health A to Z. An anal fistula is a small tunnel that develops between the end of the bowel and the skin near the anus where poo leaves the body. They're usually the result of an infection near the anus causing a collection of pus abscess in the nearby tissue. Anal fistulas can cause unpleasant symptoms, such as discomfort and skin irritation, and will not usually get better on their own. The end of the fistula might be visible as a hole in the skin near your anus, although this may be difficult for you to see yourself.