This is the segment Female Genitalia, Anus, and Rectum from a series of twelve videos demonstrating the procedures, pacing, positons, and examiner/patient interaction necessary to perform the physical examination.. Anatomy of the human anus. Frontal section. The anus is the final part of the gastrointestinal tract, and directly continues from the rectum, passing through the pelvic floor. The top and bottom of the anus are surrounded by the internal and external anal sphincters, two muscular rings which control defecation. [6]: 397 The anus is surrounded in its length by folds called anal valves, which.
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