|FUNCTIONAL-MORPHOLOGICAL STUDY OF THE ROOF OF MOUTH OF THE KESTREL; FALCO TINNUNCULUS (FALCONIFORMES, AVES) AND THE BUDGERIGAR, MELOPSITTACUS UNDULATUS (PSITTACIFORMES, AVES)
1Nahed A. Shawki, 2Ahmed M. Abdeen and 3Fatma A. Mahmoud
1Department of Zoology, Faculty of Science, Assiut University
2 Department of Zoology, Faculty of Science, Al-minsora University
3Department of Zoology, Faculty of Science, Assiut University
The roof of the mouth (palate) of the two studied bird species; the common kestrel, Falco tinnunuculus and the budgerigar, Melopsittacus undulatus is distinguished into two regions; the palate region and the pharyngeal region. The roof of the mouth of the two studied bird species is covered by a stratified squamous epithelium with distinct keratinized layer like that of the most typical birds. The histological investigation revealed that mucosa of the palate region of the common kestrel is covered by thick β-keratin layer, as well as, the palatine and pharyngeal papillae, while the mucosa of the pharyngeal region is covered by α-keratin layer. Meanwhile, in the budgerigar, the mucosa of the palate and pharyngeal region is covered by α-keratin layer while β-keratin layer is appeared only on the palatine and pharyngeal papillae. Scanning electron microscope (SEM) investigation along the whole length of the roof of the mouth of the two bird species revealed the presence of deciduous epithelium with borders of the epithelial cells. High magnification of SEM reveals the surface of the roof of the mouth is characterized by the presence of microridges.
Keyword: Falco, Melopsittacus, the roof of the mouth, epithelium, α-keratin, β-keratin.