Definition: terminal portion of the alimentary canal; about 4 cm long, beginning at the anorectal junction, where the rectal ampulla abruptly narrows as the alimentary canal pierces the pelvic diaphragm (levator ani), and ending at the anal verge, when the anoderm that lines the lower anal canal changes to hairy perianal skin; surrounded by the internal and external anal sphincters.
Synonym(s): canalis analisTA
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Examples: glitazone, GI cocktail, etc.