Abstract
A triangular lingual prominence (LP) is a characteristic part of the tongue in Anseriformes containing adipose tissue. The parakeratinized epithelium (PEp) covers the LP. Studies aimed to describe the histogenesis of PEp during the process of the intensive formation of the LP in domestic goose during embryonic period and to determine the structural readiness to perform a protective function. The study were conducted by using LM, SEM and TEM technique. The results revealed that on day 16th the undifferentiated epithelium of LP transformed into the typical avian multilayered epithelium. Contrary to pattern of histogenesis of parakeratinized epithelium on the lingual body, on the medial and lateral areas of the elongating and bulging LP were formed epithelial furrows. Which around 20th day, on lateral areas of LP deepened up to half of epithelium, whereas on the medial area began to fade. The ultrastructure of cells lying in furrows indicated progressive apoptosis-like degeneration. On the 25th day, shallow furrows were only present on lateral areas, where bulging of LP was continued. Whereas the epithelium on medial area started cornification by the accumulation of cytokeratin fibers. Lack of the periderm during the development of the PEp of the LP indicated its endodermal origin.
Highlights
RER Rough endoplasmatic reticulum Sl Superficial layer UInt Upper part of the intermediate layer V Vesicle
It should be emphasized that detailed ultrastructural observations have shown that the cornified layer in the ortho- and parakeratinized epithelium is composed of electron dense cells covered by electron lucent cells[6]
Literature published to date about histogenesis of the lingual epithelium in avian species is limited
Summary
RER Rough endoplasmatic reticulum Sl Superficial layer UInt Upper part of the intermediate layer V Vesicle. The orthokeratinized epithelium is present at places directly involved in food intake It forms the lingual nail involved in the pecking. It covers the conical papillae present on the lateral edges of the tongue in Anseriformes, involved in grazing green parts of plants[2,3,4,5,7]. It should be emphasized that detailed ultrastructural observations have shown that the cornified layer in the ortho- and parakeratinized epithelium is composed of electron dense cells covered by electron lucent cells[6]. The cytoplasm of electron dense cells in the orthokeratinized epithelium is filled with bundles of keratin fibres arranged horizontally to the basal m embrane[6]. In the case of electron lucent cells, it has been shown that in both ortho- and parakeratinized epithelium, the cell cytoplasm is filled with short and loosely arranged bundles of keratin fibres[6]
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