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Ultrastructural observations on the peritoneum in the mouse
1Department of Anatomy, University College of Dublin, Ireland, UK.
Abstract:
The serous mesothelium of the serosa and mesentery of the small intestine in the mouse were examined by scanning and transmission electron microscopy. The serosa consisted of a single layer of flattened microvilli-bearing cells containing nuclei, caveolae and micropinocytotic vesicles. The observations in this study differed from previous reports on mesothelial surfaces in two respects. A surface layer of amorphous material was present over parts of the serosa. This layer probably represents serous fluid trapped by the mesothelial microvilli but is unaffected by prefixation rinsing in saline or ultrasonic cleaning. The layer is lost following osmication and routine processing for transmission electron microscopy. The possibility that a serous fluid layer may be preserved in this way may be useful in assessing changes in the peritoneum. Stomata were observed in the mesentery but there was no evidence of a connection with the lymphatic system. The presence of mesenteric stomata may explain the difference in permeability reported between parietal peritoneum and mesentery.
Insights
This study reveals a novel surface layer on mouse small intestine serosa, potentially preserving peritoneal fluid. Mesenteric stomata were observed, possibly explaining differences in parietal peritoneum and mesentery permeability.
Area of Science:
- Gastroenterology
- Cell Biology
- Microscopy
Background:
- The serous mesothelium lining the abdominal cavity plays a crucial role in peritoneal function.
- Understanding the ultrastructure of the mesothelium is key to comprehending peritoneal fluid dynamics and transport.
Purpose of the Study:
- To investigate the ultrastructural characteristics of the mouse small intestine serosa and mesentery using advanced microscopy techniques.
- To identify and characterize any novel surface features or structures present on the mesothelium.
Main Methods:
- Scanning electron microscopy (SEM) for surface visualization.
- Transmission electron microscopy (TEM) for detailed ultrastructural analysis.
- Examination of mouse small intestine serosa and mesentery.
Main Results:
- Identified a unique amorphous surface layer on parts of the serosa, likely trapped serous fluid, resistant to initial cleaning but lost during TEM processing.
- Observed stomata in the mesentery, with no discernible connection to the lymphatic system.
- Characterized the serosa as a single layer of flattened, microvilli-bearing cells with specific organelles.
Conclusions:
- The novel surface layer may offer a method for preserving and assessing peritoneal fluid in future studies.
- The presence of mesenteric stomata could account for observed differences in permeability between the parietal peritoneum and mesentery.