The infrastructure of the wall of the terminal gastric mucosa vessels (of Corpus and pars pylorica) of 15 adult rats was investigated. It was established that the number of fenestrated vessels as well as the degree of fenestration in direction to the glandular cells enhanced along with vascidar caliber increasing. While the thickness of the endothelial cells and the amount of their organelles reduced there was an elevation of the count and length of luminal evaginations. The basal membrane became thinner and the pericytes reduced in number. These alterations could be better established in the subepithelial vessels (mainly in the venous capillaries and postcapillary venules) which was more outlined in the pyloric region. The gastric mucosal veins were presented by venules without myocytes but with pericytes. Some arteries could be observed in the submucosa only. The fenestration was interpreted in the sense of possible participation in the ionic transport.
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