Description

The upper 2/3 of the anal canal has longitudinal folds or elevations of tunica mucosa. Its mucosa is lined by simple columnar epithelium. The lumen of the anal canal presents, in its upper half, a number of vertical folds, produced by an infolding of the mucous membrane and some of the muscular tissue. They are known as the anal columns (rectal columns; Morgagni), and are separated from one another by furrows (anal sinuses; rectal sinuses), which end below in small valve-like folds, termed anal valves (Ball's), which join together the lower ends of the rectal columns


Cette définition contient du texte provenant d'une édition publique de Gray's Anatomy (20eme édition Américaine de "Gray's Anatomy of the Human Body" publiée en 1918 - http://www.bartleby.com/107/).

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