Summary
Preliminary to a study on ultrastructural alterations in the foregut epithelium of Rana esculenta during hibernation, the structure of the epithelium in normal summer frogs is described.
The foregut can be divided into three parts: the oesophagus, the forestomach and the stomach. In the epithelium eight cell types could be discerned. Chief cells are found only in the oesophagus and forestomach; parietal cells are limited to the stomach; argentaffin cells are present in both stomach and forestomach; surface mucous cells line the walls of stomach and forestomach; goblet cells and ciliated cells constitute the surface epithelium of the oesophagus; and finally mucous neck cells and intermediate cells are present in the glands of all three zones.
Like chief cells, parietal cells contain granules with a presumably proteinaceous content, and thus correspond to the oxynticopeptic cells described in previous histological studies on the amphibian gastric mucosa.
All cell types contain lipid droplets. Especially in surface mucous cells and parietal cells, these droplets are extremely numerous. Their possible role is discussed.
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Geuze, J.J. Light and electron microscope observations on the gastric mucosa of the frog (Rana esculenta). Z. Zellforsch. 117, 87–102 (1971). https://doi.org/10.1007/BF00331104
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DOI: https://doi.org/10.1007/BF00331104