Updated on November 6, 2024 Anatomy of the Anal Canal Above the dentate lineBelow the dentate lineOriginHindgut (Endoderm)Cloaca (Ectoderm)EpitheliumSimple columnarNon-keratinizing stratified squamousArterial supplySuperior rectal artery br. IMAInferior rectal artery br. of internal pudendalVenous drainageInternal hemorrhoidal plexus → portal systemExternal hemorrhoidal plexus → internal iliacLymphatic drainageInternal ilic nodesSuperficil inguinal nodesInnervationInferior mesenteric plexus; Inferior hypogastric plexus; Pelvic...
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