Anatomy anal

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Benign Anorectal Disorders pp Cite as. Rectum is a fixed terminal portion of the large intestine that serves as a reservoir. It is about 10—14 cm in length, and it is located between the sigmoid colon above and the anal canal below. It begins at the level of S3 vertebra and ends by becoming continuous with the anus which corresponds to the apex of the prostate or lower end of the vagina and is 2—3 cm in front of and a little below the tip of the coccyx. 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 ; Chapuis et al.
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The Anal Canal

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Surgical Anatomy of Anal Canal and Rectum | SpringerLink

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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Anatomy of the Anus

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.
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