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Musculus sphincter ani externus in the rat
1Department of Anatomy, Faculty of General Medicine, Charles' University, Prague, Czechoslovakia.
Anatomischer Anzeiger
|January 1, 1989
Summary
The study details the external anal sphincter muscle (MSAE) in rats, revealing its complex structure. This research clarifies the anatomical arrangement and fiber orientations within the rat MSAE.
Area of Science:
- Anatomy
- Comparative Anatomy
- Gastroenterology
Background:
- The external anal sphincter muscle (MSAE) plays a crucial role in fecal continence.
- Understanding the detailed anatomical structure of the MSAE is essential for comparative studies and potential therapeutic interventions.
Purpose of the Study:
- To provide a detailed morphological description of the M. sphincter ani externus (MSAE) in the rat.
- To elucidate the structural arrangement and fiber pathways within the rat MSAE.
Main Methods:
- Histological examination of the rat M. sphincter ani externus.
- Detailed anatomical dissection and morphological analysis.
Main Results:
- The rat MSAE forms a circular ring (1-1.25 mm height, 250-350 microns thick) with a posterior longitudinal muscle plate.
- Key structures include columns of longitudinal smooth muscle, pars profunda, pars superficialis, and pars subcutanea with distinct fiber transitions.
- Longitudinal muscle fibers from the columns extend to form the dorsal plate, with complex fiber crossings and attachments to surrounding tissues.
Conclusions:
- The rat MSAE exhibits a complex, multi-layered structure with specific fiber arrangements contributing to its function.
- This detailed anatomical description provides a foundation for further research into anal sphincter physiology and comparative anatomy.