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The development and morphology of some lingual structures were studied in the tongues of porcine foetuses at 76, 81 and 94 days after fertilization, of piglets 2 days after birth and of adult pigs. Special attention was given to the morphogenesis of circumvallate papillae and the differentiation of taste buds in papillary epithelium. The formation of the other types of papillae, and the development of the lamina propria mucosae and the related structures were also investigated. Taste buds prevailed in the wall epithelium of the circumvallate papilla, while in its dorsal surface they occurred only occasionally during the first stages of the period studied. The amount of taste buds increased gradually in foliate papillae. In the period under study taste buds showed distinct differentiation of their cells. The porus gustatorius formed immediately after the taste bud reached the surface of epithelium. "Secondary" ducts of the gll. gustatoriae observed in circumvallate papillae in the late prenatal periods were present till birth. The development of the other lingual papillae followed that of circumvallate papillae.

The Morphogenesis of Circumvallate Papillae and the Differentiation of Taste Buds in the Porcine Foetus from Day 76 till Birth and in the Adult Pig