Comparative microanatomical and histochemical biodistribution profiles of different types of mucins in the intestinal mucosa of some tetrapod representatives

AbstractThe microanatomical features of the intestinal tract mucosa layer in different species of tetrapoda vary according to the type of species, tissue, and function of the targeted cells. In the present study, we have evaluated the histological and histochemical variations of the intestinal tract in four species representing superclass tetrapoda.Bufo regularis (toad),Trachylepis quinquetaeniata (lizard),Columba livia domestica (pigeon) andMus musculus (mouse) were used as representatives for amphibians, reptilians, avians and mammalians respectively. Histologically, the ileum ’s mucosal layer of the lower tetrapods (toad and lizard) was almost similar and consists of elongated finger-like shape villi lined with simple columnar epithelium and goblet cells. Similarly, the microanatomical features in ileum of higher tetrapod representatives (pigeon and mouse) were charact erized by the presence of villi lined with simple columnar epithelium and scattered goblet cells as well as intestinal glands (crypts of Lieberkühn) at the bases of the intestinal villi. In the toad rectum, the mucosal layer was similar to that of the ileum but with shorter villi and more numerous goblet cells. However, the mucosal layer of the rectum in the lizard had low numbers of absorptive columnar epithelial cells with abundant goblet basal cells. Comparatively, the pigeon’s rectal mucosa had almost a similar structure to that of ileum but in leaf-like shaped villi. Finally, the rectu m of the mou...
Source: Journal of Molecular Histology - Category: Laboratory Medicine Source Type: research