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The problem of anorectal continence.

A M Holschneider

    Progress in Pediatric Surgery
    |January 1, 1976
    PubMed
    Summary

    Anorectal continence relies on the rectum and pelvic floor muscles, particularly the puborectalis muscle, which initiates continence reflexes. The internal anal sphincter maintains resting pressure and relaxes to enable defecation.

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    Area of Science:

    • Physiology
    • Anatomy
    • Gastroenterology

    Background:

    • Anorectal continence is crucial for quality of life.
    • It involves complex interactions between the rectum, pelvic floor muscles, and anal sphincters.
    • Understanding these mechanisms is key to addressing incontinence.

    Purpose of the Study:

    • To elucidate the physiological mechanisms underlying anorectal continence.
    • To highlight the specific roles of the puborectalis muscle and internal anal sphincter.
    • To explain the integrated function of these structures in maintaining fecal continence.

    Main Methods:

    • Review of anatomical and physiological data on anorectal structures.
    • Analysis of the sensory and motor functions of the puborectalis muscle.
    • Examination of the properties and reflex mechanisms of the internal anal sphincter.

    Main Results:

    • The rectum adapts to delay stool passage, with pressure gradients aiding retrograde movement.
    • The puborectalis muscle is vital for continence due to its sensory receptors and motor activity, influencing the anorectal angle.
    • The internal anal sphincter provides resting pressure and initiates defecation through complex inhibitory neural pathways.

    Conclusions:

    • Anorectal continence is a sophisticated interplay of rectal accommodation, puborectalis muscle function, and internal anal sphincter dynamics.
    • The puborectalis muscle's sensory and motor roles are critical for triggering continence reflexes.
    • The internal anal sphincter's unique properties enable both resting barrier function and reflex relaxation for defecation.

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