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Related Experiment Videos

Internal anal sphincter: an anatomic study.

A Uz1, A Elhan, M Ersoy

  • 1Ankara University, Faculty of Medicine, Department of Anatomy, Ankara, Turkey. aysunuz99@yahoo.com

Clinical Anatomy (New York, N.Y.)
|December 26, 2003
PubMed
Summary

This study reveals the internal anal sphincter

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Area of Science:

  • Anatomy
  • Surgical Anatomy
  • Gastroenterology

Background:

  • Understanding internal anal sphincter anatomy is crucial for anorectal surgery.
  • Previous descriptions of the internal anal sphincter are less detailed.

Purpose of the Study:

  • To investigate the detailed anatomy of the internal anal sphincter and surrounding structures.
  • To provide a clearer anatomical basis for surgical procedures.

Main Methods:

  • Examination of 24 cadavers using a surgical microscope (6-25x magnification).
  • Detailed observation and documentation of the internal anal sphincter's structure.

Main Results:

  • The internal anal sphincter consists of stacked flat rings of smooth muscle bundles, resembling Venetian blind slats.
  • An average of 26.33 (range 20-30) ring-like slats were observed, each covered by fascia.
  • Muscle fibers and fascia coalesce into three distinct columns at specific locations (1, 5, and 9 o'clock positions).

Conclusions:

  • The newly described anatomy of the internal anal sphincter, particularly the columnar structures, may be vital for anal canal closure.
  • This detailed anatomical understanding can help prevent complications during anorectal surgery and maintain bowel continence.

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