The anal canal forms an angle (Anorectal flexure; Perineal flexure) with the lower part of the rectum (Anorectal junction), and measures from 2.5 to 4 cm. in length.

This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from


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