Recommended incivek-telaprevir Drugs. Etymology Glossary Table of Contents. Anal Cancer This page is intended to provide information about anal cancer and its precursors, high grade and low grade anal squamous intraepithelial lesions HSIL and LSIL respectively. The anal canal mucosa is cuboidal in the transitional zone and columnar above it; it is insensitive to pain. Fistula-in-ano can be intersphincteric, trans-sphincteric, or suprasphincteric. At the anorectal junction, the gut curves backward and its concavity is held by the puborectal sling, which can be palpated per anum. Lasts Anatomy Regional and Applied.
Parasympathetic fibers supply the smooth muscle, including the internal sphincter. Fig 2 — The peritoneal reflections of the rectum in males A and females B. At the anorectal junction, the gut curves backward and its concavity is held by the puborectal sling, which can be palpated per anum. The large intestine , also known as the large bowel or colon, is the last part of the gastrointestinal tract and of the digestive system in vertebrates.
Most significant are the prostate and seminal vesicles in males, and cervix in females. They may be internal above the pectinate line: This has the advantage that the muscle is slowly cut and fibroses at the same time in order to cause as little damage as possible to the sphincter complex. Please help improve this article by adding citations to reliable sources. The peritoneum firmly attaches the rectum to the sacrum.
The two parts are the zona hemorrhagica and zona cutanea, lined by stratified squamous non-keratinized and stratified squamous keratinized epithelium, respectively. The anal sphincters can be felt by an index finger inserted into the anal canal and rectum. Ss — Suprasphincteric fist. Note that the dentate line is a "watershed area" and that the exact transition of epithelium and neurovascular supply is varied. Anatomy of the gastrointestinal tract , excluding the mouth. The deep part, more or less continuous with the superficial division, surrounds the uppermost portion of the canal and is associated with the puborectalis posteriorly. The puborectal sling and the sphincters relax, and the rectal musculature contracts.