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Issues in anatomy: the external anal sphincter revisited
1Faculty of Medicine and Health Sciences, University of Newcastle, Callaghan, New South Wales, Australia.
The Australian and New Zealand Journal of Surgery
|September 1, 1996
Summary
Anatomy textbooks often present outdated information, creating conflicts in examinations. The external anal sphincter
Area of Science:
- Anatomical science
- Surgical anatomy
- Medical education
Background:
- Traditional anatomy textbooks may not accurately represent current scientific understanding.
- Discrepancies exist between textbook descriptions and research findings in anatomy.
- This impacts anatomical examinations and the training of medical professionals.
Purpose of the Study:
- To highlight the discrepancy between textbook anatomy and current research.
- To use the external anal sphincter as a case study for anatomical controversies.
- To emphasize the dynamic nature of anatomical science for trainees.
Main Methods:
- Review of anatomical literature concerning the external anal sphincter.
- Comparison of textbook descriptions with research-based anatomical models.
- Analysis of the implications for anatomical education and examination.
Main Results:
- Textbook descriptions of the external anal sphincter as three circular parts are challenged by research.
- Evidence suggests the external anal sphincter is composed of three distinct loops.
- The puborectalis, coccyx, and pre-anal skin contribute to these loops.
Conclusions:
- Anatomy is an evolving science, not a static discipline.
- Idealized textbook descriptions may not reflect actual anatomical structures or ongoing research.
- Medical trainees must recognize anatomical controversies and advancements beyond textbook knowledge.