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Related Experiment Videos

Dynamics of the rectum and anus.

H L Duthie

    Clinics in Gastroenterology
    |September 1, 1975
    PubMed
    Summary

    The anorectum manages rectal contents through subconscious and voluntary muscle control. Key responses include rectal accommodation, content sampling, and complex defecation, all vital for bowel function.

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    Area of Science:

    • Gastroenterology and Physiology

    Background:

    • The anorectum integrates smooth and striated muscle sphincters for bowel control.
    • Rectal responses to colonic material entry are typically subconscious but can be voluntarily influenced.

    Purpose of the Study:

    • To elucidate the physiological responses of the anorectum to rectal contents.
    • To describe the mechanisms of rectal accommodation, sampling, and defecation.

    Main Methods:

    • Observational study of anorectal function.
    • Analysis of physiological responses including pressure changes and sphincter activity.

    Main Results:

    • The rectum demonstrates an accommodation response, adapting to contents and reducing pressure rise.
    • A sampling response involves transient internal anal sphincter relaxation for content assessment.
    • Defecation involves complex neuromuscular coordination, with controlled and urgent pathways.

    Conclusions:

    • The anorectum exhibits sophisticated responses to manage rectal contents.
    • Understanding these mechanisms is crucial for addressing defecation disorders.

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