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Chemoreceptive epithelioid cells in the chicken aorta. An electron microscopical study
Y Kon1, M Miyoshi, Y Hashimoto
1Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan.
Anatomia, Histologia, Embryologia
|July 4, 1998
Summary
Chicken aorta granulated epithelioid cells were studied using electron microscopy. These cells, found in the tunica interna and tunica media, suggest distinct roles in aortic function and nervous system control.
Area of Science:
- Cardiovascular Biology
- Cell Biology
- Histology
Background:
- Granulated epithelioid cells are known to aggregate within the chicken aorta.
- Their precise localization and functional implications require further investigation.
Purpose of the Study:
- To investigate the locational characteristics of epithelioid cells in the chicken aorta using electron microscopy.
- To elucidate the potential functional roles of these cells based on their microenvironment and cellular interactions.
Main Methods:
- Electron microscopy was employed to examine the ultrastructure and location of epithelioid cells.
- Horseradish peroxidase injection was used to assess intercellular permeability and transport.
Main Results:
- Epithelioid cells were identified in two primary locations: the tunica interna (subendothelial) and the intermediate tunica media.
- Subendothelial epithelioid cells interacted with endothelial cells and were exposed to the aortic lumen, with no observed neural contact.
- Tunic media epithelioid cell aggregates showed synaptic structures and close contact with smooth muscle cells, suggesting neural control.
Conclusions:
- Epithelioid cells in the subendothelial region may receive signals directly from the aortic lumen.
- Aggregations of epithelioid cells in the tunica media appear to be under nervous system regulation.
- These findings highlight distinct functional specializations of epithelioid cells within different aortic compartments.