Surrounded by the levatores ani, the anal canal passes through the pelvic diaphragm see fig. The congenital anomaly in which the anal canal fails to communicate with the exterior is known as imperforate anus. The rectum has neither mesentery nor haustra, and it has an almost complete outer longitudinal muscular coat rather than teniae. The puborectal sling and the sphincters relax, and the rectal musculature contracts.
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Surrounded by the levatores ani, the anal canal passes through the pelvic diaphragm see fig. The interval between the internal and external sphincters may be marked by a white line. Anatomical terminology [ edit on Wikidata ]. The ring at the terminal portion of the anal wife cuckold erotic stories is called the anus.
The external anal sphincter muscle is the voluntary muscle that surrounds and adheres to the anus at the lower margin of the anal canal. In animals, gland expungement can be done routinely every 24 — 36 months to prevent infection and fistula formation. It is differentiated from the rectum by the transition of the internal surface from endodermal to skinlike ectodermal tissue. Lacks a peritoneal covering Three histologic types:
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