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Overview introductions location , extent , dimensions of anal canal embryology the anorectal ring ,the puborectalis muscle anal sphincters & the intersphincteric plane the epithelium and sub epithelial structures (internal.). The proximal part of the rectum joins the sigmoid colon at the rectosigmoid junction which is at about 15 cm from the anal verge, and the distal part joins the anal canal at the anorectal junction. The cardinal features of large intestine like the taenia, appendices epiploicae, sacculations, and well-defined mesentery are absent in the rectum (corman 2005 chapuis et al.). Surgical anatomy of the anal canal, and the operative treatment of hmorrhoids. -the skin-like lining below the valves, e as far distally as the skin of the anus, is dull white, smooth, adherent to the subjacent tissues and extremely sensitive. The quotsurfacequot anatomy of the anal canal is described together with the palpable landmarks and their relation to pathological lesions and to function. (3) the identification of fistulous tracks, their surgical treatment in relation to the anal musculature,. The surgical correction of chronic internal anal (sphincteric) contracture. The anal canal, thought of mostly as the final exit for what we ingest, is more intricate a structure than most would believe. 5 cm to 4 cm in length, it plays a vital role as a defense against organisms trying to make their way into the body, can differentiate between solid liquid and gas, and as a set of muscles that continence. Definition surgical anatomical the anal canal is the terminal portion of the intestinal tract it begins at the anorectal junction (the point passing through the levator ani muscles), is about 4 cm long, and terminates at the anal verge. 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.