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Year :2017
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Month :
September-October
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Volume :
6
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Issue :
4
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Page :
SO01 - SO05
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An Anatomical Study of Internal Anal Sphincter with Clinical Correlation
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Correspondence Address :
Murali Krishna, Manoj Kumar,
Dr. Manoj Kumar,
Professor, Department of Surgery, Armed Forces Medical
College, Pune-411040, Maharashtra, India.
E-mail: drmanojsurgeon@yahoo.co.in
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Introduction: Introduction: The anatomy of Anal Sphincter Complex (ASC) still is a mystery even in this modern time. Knowledge of the exact anatomy is helpful in diagnosis and management of anorectal diseases. With the high prevalence of anorectal diseases it is imperative that there is a clear understanding of the underlying anatomy.
Aim: To characterize the constitution of Internal Anal Sphincter (IAS) and understand its clinical impact and to investigate the presence of any midline fixity of fibers of IAS and understand its clinical impact.
Materials and Methods: This is an observational study based on cadaveric dissection. Fifteen cadavers were used for the study. The ASC was dissected out from the cadavers and was bivalved to visualize the IAS. Further, dissection was done to delineate the anatomy of IAS. The average length and breadth of IAS was studied. The number of fibers in IAS was studied. Distance of IAS from anal verge and dentate line was studied. Midline fixity of IAS was studied.
Results: The mean length of IAS was 33 mm (0.67), width was 3.6 mm (0.83). The number of fibers was 22.94 (3.55). The average distance from anal verge was 8.0 mm (1.4) and from the dentate line was 10.86 mm (1.95). Midline fixity was appreciated at 12 O’ clock and 6 O’ clock. The mean width of anterior fixation was 4.61 mm (1.02) and posterior fixation was 12.15 mm (2.11) .
Conclusion: The detailed anatomy of IAS with number of fibers and their arrangement was described. The anatomy of midline fixity described in this study as per our knowledge has never been reported before in the literature. To know the exact physiological purpose of this structure further study would be required.
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