Rectum and anus

The rectum, about 15 cm long, widens below as the ampulla, which is very distensible. Accessed June 23, In surgical usage, however, the anal canal is frequently limited to that part of the intestine below the pectinate line; this part differs from the part above the pectinate line in several respects, including innervation, venous and lymphatic drainage, and possibly lining epithelium. Motor fibers are shown in red, parasympathetic fibers as interrupted lines, and sensory fibers in blue. The rectum is the concluding part of the large intestine that terminates in the anus. Some chemotherapy may be given once every few weeks, while in other cases it is given daily. The fibers in the pelvic splanchnic nerves reach the intestine by way of plexuses.
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Physiology

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Rectal Pain: Symptoms & Signs

Colorectal cancer is the third most commonly diagnosed cancer in men and women. Most cases of leiomyoma were treated by excision, while most cases of leiomyosarcoma were treated by abdominoperineal resection, a finding consistent with old data. An endoscopy is a procedure where a doctor uses an endoscope — a small, flexible tube with a camera and light — to examine areas inside the body. Some cancers involving the bowel run within families hereditary colorectal cancers. You may be embarrassed to talk about your anal troubles.
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Rectal Pain: Get Information About Causes and Treatment

The rectum is located within the pelvic cavity , and is the most posterior of the pelvic viscera. If you do not agree to the foregoing terms and conditions, you should not enter this site. The criteria for functional fecal incontinence have been broadened to include incontinence associated with diarrhea as well as constipation. Infection with human papillomavirus HPV , anal sex, and multiple sexual partners increase the risk. This is distinct from fecal incontinence due to neurological injury, seepage from prolapsed rectal mucosa, poor hygiene, and willful soiling. An endoscope flexible tube with a lighted camera on its tip is inserted into the anus and moved into the colon. A large number of bacteria thrive in the large intestine.
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Ask your doctor what you might expect from your specific treatment program. Take this quiz to learn the causes of cancer. An anal fissure is a small tear or cut in the skin lining of the anus. Author links open overlay panel David S. As a further example, we found no appreciable sex difference; however, we did find more cases reported in females. However, after the age of 2 or 3, children develop voluntary control of the bowel function. These bacteria include Escherichia coli, Enterobacter aerogenes, Streptococcus faecalis and Clostridium perfringens.
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