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Related Experiment Videos

Anorectal closing mechanisms

P M Wilson

    South African Medical Journal = Suid-Afrikaanse Tydskrif Vir Geneeskunde
    |May 28, 1977
    PubMed
    Summary
    This summary is machine-generated.

    The anorectum uses vascular anal cushions and smooth muscle for continence. This study explores their function, hemorrhoid concepts, and surgical relevance.

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    Area of Science:

    • Anatomy
    • Physiology
    • Colorectal Surgery

    Background:

    • The anorectum's complex structure facilitates fecal continence.
    • Vascular anal cushions, supported by smooth muscle and elastic tissue, play a crucial role in sealing the anal canal.
    • Understanding these structures is vital for diagnosing and treating anorectal conditions.

    Purpose of the Study:

    • To analyze the refined sealing mechanisms of the anorectum.
    • To present new concepts regarding hemorrhoids and anal cushions.
    • To clarify anatomical discrepancies and provide a surgical framework for the anal cushion concept.

    Main Methods:

    • Review of morphological, pressure, motility, and electromyographic studies.
    • Analysis of literature on anorectal anatomy and physiology.

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  • Illustrative support for the tripartite sealing plug theory.

    • Main Results:

    • Vascular anal cushions, when distended, effectively plug the anal lumen, ensuring continence.
    • Identified discrepancies in the literature regarding the pectinate/dentate line's location.
    • Proposed that musculus submucosae ani should not be referred to as Treitz's muscle.

    Conclusions:

    • The anal cushion is a key component of anorectal continence, functioning as a tripartite sealing plug.
    • Clarified anatomical and functional aspects of the anorectum, offering insights into hemorrhoid etiology.
    • Provided a refined understanding of anorectal neuromusculature and sealing devices for surgical application.