Anatomy of the anal canal
At the level of the middle of the sacrum, the sigmoid colon loses its mesentery and gradually becomes the rectum, which, at the upper limit of the pelvic diaphragm, ends in the anal canal fig. The rectum, about 15 cm long, widens below as the ampulla, which is very distensible. Although variable in shape, the rectum follows the sacrococcygeal curve. At the anorectal junction, the gut curves backward and its concavity is held by the puborectal sling, which can be palpated per anum.
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The anal canal is located within the anal triangle of the perineum between the right and left ischioanal fossae. It is the final segment of the gastrointestinal tract, around 4cm in length. The canal begins as a continuation of the rectum , and passes inferoposteriorly to terminate at the anus. Except during defecation, the anal canal is collapsed by the internal and external anal sphincters to prevent the passage of faecal material. It is formed by the fusion of the internal anal sphincter, external anal sphincter and puborectalis muscle, and is palpable on digital rectal examination. Above the anal valves are small pouches which are referred to as anal sinuses — these contain glands that secrete mucus.
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The anal canal is the terminal segment of the large intestine between the rectum and anus , located below the level of the pelvic diaphragm. It is located within the anal triangle of perineum , between the right and left ischioanal fossa. As the final functional segment of the bowel, it functions to regulate release of excrement by two muscular sphincter complexes. The aperture at the terminal portion of the anal canal is known as the anus. In humans, the anal canal is approximately 2.
NCBI Bookshelf. Abdelwahab Ahmed ; Waqar A. Authors Abdelwahab Ahmed 1 ; Waqar A. Qureshi 2. The anal canal, thought of mostly as the final exit for what we ingest, is more intricate a structure than most would believe.