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Papillary Architecture and Functional Characterization of Mucosubstances in the Sheep Tongue.

This research aimed to reveal the general morphology and topographic distribution of lingual papillae, epithelial characteristics, mucosal structure, and glands with their mucin content in the sheep tongue, with consideration of species-specific characteristics. The tongues of ten sheep were analyzed for this purpose. Filiform and fungiform papillae existed within the borders of the ventral surface of the lingual apex. The majority of the filiform papillae had multiple secondary projections. Fungiform papillae were also seen on the lingual torus among lenticular papillae, as well as 6 to 10 circumvallate papillae arranged on its caudal border. The species-specific details of the general anatomical structure of the tongue were determined and, in general, the papillary organization in the sheep was similar to goats, while the papillary organization also was similar to features with deer species, specifically the filiform papilla from the mechanical papillae and fungiform papilla from the gustatory papillae. Neutral and weak sulfated mucins and N-acetyl sialomucins were located in seromucous glands, salivary duct epithelium and von Ebner's glands. Carboxylated acid mucins and N-acetyl sialomucins were not present in seromucous and von Ebner's glands. In seromucous glands, MUC1, MUC5AC and MUC6 localized only in epithelial cells of ducts, whereas MUC2 localized in both glandular and ductal epithelial cells. All MUCs were present in both von Ebner's glands and salivary ducts. We showed that this mucin composition, may serve as a physical barrier in the initial section of the digestive system. This article is protected by copyright. All rights reserved.

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