Histogenesis of filiform papillae in buffalo during prenatal life
2009
Verma, Deepanjali | Uppal, Variander | Bansal, Neelam
The present study was conducted on the tongue of 36 buffalo foetii (approximate age ranging from 34 days to 298 days). Based on the CVR length, the foetii were divided into 3 groups_group 1: foetii between 0_20 cm CVR; group 2: foetii between 20_40 cm CVR; and group 3: foetii above 40 cm CVR. The paraffin sections were stained with hematoxylin and eosin, Masson's trichrome, Gridley's, Verhoeff's and with Holme's method. The first indication of formation of filiform papillae was observed at 45.0 cm CVR length (175 days). The first evidence of keratinization had also begun at 45.0 cm CVR length with the appearance of keratohyaline granules in the epithelial cells over the developing papillae. The epithelium enveloping the spine of papillae on the anterior aspects contained the soft keratin producing cells and the epithelium covering the posterior aspect contained the hard keratin producing cells. The connective tissue core of the developing filiform papillae contained fibroblast, some mesenchymal cells, fine collagen fibers, few reticular fibers and blood vessels. During the later stages of group 3, the shape of lingual papillae changed significantly from rounded head to pointed.
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