Anorectal Spaces

Knowledge of the anorectal spaces is important in the understanding of anorectal and pelvic floor disorders and to avoid injury to important structures during surgical therapy.

The perianal space is that area surrounding the anal canal in the immediate area of the anal verge. Laterally it is continuous with the fat of the buttocks. Cephalically, it is continuous with the intersphincteric space and it contains the distal EAS, branches of the inferior rectal vessels, nerves, and lymphatics. The external hemorrhoid plexus lies in the perianal space and communicates with the internal hemorrhoid plexus at the dentate line.

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