Rectum and anal canal

Sign in to save your search Sign in to your personal account. The clinical implication of these results is that for upper and middle rectal carcinomas, the anal canal should be excluded from the field of irradiation; for low rectal cancers, if technically possible, adequate shielding of the anal sphincter should be performed. This information was clinically relevant because 2 patients in this group had a dramatic reduction in RP, which caused the surgeon to delay ileostomy closure. It is generally recognized that adjuvant radiotherapy is a major determinant of poor bowel function after restorative proctectomy or low anterior resection. The anal canal is the terminal part of the gastrointestinal tract. Three factors are likely to affect irradiation-induced damage to pelvic normal tissues: Promoting factors for this are continus pushing due to obstipation, pregnancy, alcohol and long periods of seated activity.
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Rectum, Anus, and Anal Sphincter

Articles Cases Courses Quiz. Tell us your feedback: Are you more of a visual learner? Games Movies TV Wikis. Up-to-date information is provided on all facets of colonic, rectal, and anal disease. Clinical evaluation will usually include sigmoidoscopy and appropriate imaging studies such as defecography, ultrasound, or pelvic CT to exclude alternative diseases. Anatomic, physiologic, and diagnostic principles are presented.
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Anal canal | anatomy | jeuxdeboxe.info

It is stimulated by movement of food into the stomach. If you do not agree to the foregoing terms and conditions, you should not enter this site. This is an article covering the origins, insertions, innervation and functions of the muscles of the pelvic floor. The lower anal canal and the anal opening are composed of two muscular constrictions that regulate fecal passage. We welcome suggested improvements to any of our articles.
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This is under conscious control Defecation therefore involves involuntary contraction of rectal muscle and relaxation of the internal anal sphincter. These cancers look slightly different under a microscope, but they behave and are treated like other squamous cell carcinomas of the anal canal. Bacteria residing in the large intestine are normally harmless in humans. Colon and Rectal Surgery. Rectum , terminal segment of the digestive system in which feces accumulate just prior to discharge. The middle rectal vein drains primarily the muscular layer of the lower part of the rectum and upper part of the anal canal. The ascending colon moves upwards from caecum to the level of the liver.
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