Histological, Histochemical, and Scanning Electron-Microscopical Studies on the Vestibular Region of Nasal Cavity in Dogs
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Keywords:
Vestibule, Alar fold, Straight fold, Dogs, Scanning electron-microscopyAbstract
The present study was conducted to determine the histological, histochemical, and scanning electron-microscopical details of the vestibular region of the nasal cavity in adult dogs. The mucosa of the vestibular region (straight and the alar folds, and rostral portions of the dorsal and ventral nasal turbinates) was lined by a non-keratinized stratified squamous epithelium. The superficial part of the propria submucosa contained different connective tissue cells, collagen, elastic, and reticular fibres in various concentrations, isolated sero-mucous glands, fine blood capillaries, small blood vessels, and venous caverns-like structures. The deeper portion featured large clusters of sero-mucous glandular acini along with their ducts, nerve bundles, and blood vessels. Hyaline cartilage in the deeper part formed a supportive framework. The stratified squamous lining, gradually transitioned caudally into stratified cuboidal (transitional zone) to pseudostratified columnar type with occasional goblet cells. The glandular units reacted differently to various histochemical stains revealing different moieties of carbohydrates but these glands were lacking proteins in their secretions. SEM presented small, irregular, scale-like flat squamous cells which were continuous with each other, displaying microplicae in various arrangements at higher magnification. In the region of transition, a few ciliated cells started appearing along with some raised cells bearing microvilli of different shapes and sizes and a few goblet cells.
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