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StomachIn the stomach of O. hepsetus, the mucosa is lined with asimple epithelium layer composed of columnar mucussecretingcells with basal nuclei. These were reactive toPAS but not to AB, revealing the presence of only neutralGCs. The stomach epithelium forms crypts along thegastric mucosa. The mucosa layer projects toward the organ’slumen, forming various gastric folds, arranged longitudinally.In the non-glandular region, the submucosaand muscular layers accompany the mucosa in formingthese folds, making the lumen very small (Figure 3).The division of the stomach observed in the presentwork is in accordance with the structural characteristicsof the two regions. The glandular region is characterizedby having well-developed tubular gastric glands,composed of oxynticopeptic cells, occupying the entirelamina propria (Figure 3B). These are smaller and lessnumerous in the initial portion and increase in numberand size in the direction of the non-glandular region. Thenon-glandular region has a well-developed muscular layer(Figure 3D and E). The submucosa layer is composed ofconnective tissue and blood vessels.In the stomach, the muscular layer is composed ofsmooth muscle fibers arranged in two directions: internalcircular and external longitudinal (Figure 3E). Theglandular region contains myenteric plexuses arranged insparse groups, composing the enteric nervous system andlocated between the muscular sub-layers, and there is aserosa layer which surrounds these structures.
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