モルモット舌乳頭の形態ならびに有郭乳頭の発生学的研究
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Lingual papillae in adult guinea pigs were observed in details on a scanning electron microscope and the development process of circumvallate papillae which present a peculiar form resembling foliate papillae was studied with use of fetuses after 30 fetal days (at 5-fetal-day intervals) and piglets after birth. The results were as follows : 1. Five types of lingual papillae are observed : filiform, fungiform, foliate, circumvallate, and conical papillae. 2. Foliate papillae at the lingual apex and those at the posterior side of the lingual body differ in morphology. The former resembles folk-prong like papillae of a kind and the latter resembles those of rats and dogs and have secondary and tertiary small papillae. 3. A pair of circumvallate papillae are located at the lingual root, one on each side. These papillae resemble foliate papillae in appearance and have three to four longitudinal sulci running sagitally. 4. Circumvallate papillae develop earliest among lingual papillae and the epithelial cords begin to penetrate from the doral epithelium into the mesenchymal tissue and proliferate shortly after 30 fetal days. 5. Longitudinal sulci along a papilla are formed in the form of canalicular clefts at the center of enlarged epithelial cords. Each cleft in time unites with a cleft formed on the surface (lingual dorsum) and comes to completion around 65 fetal days. 6. The Ebner gland begins to develop about 40 fetal days in the form of a secondary epithelial cord from the lower end of the epithelial cord extending to form a circumvallate papillae sulcus. 7. Taste buds begin to develop about 50 fetal days and taste pores open on the sulcus epithelial surface about 60 fetal days. 8. Club-like projections extending from the margin of the taste pore and cells escaping from the margin are observed. 9. Taste buds with three taste pores each (3-pore taste bud) and pairs of taste buds as if sharing a taste pore between the two are observed.
- 九州歯科学会の論文
- 1983-12-25
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- モルモット舌乳頭の形態ならびに有郭乳頭の発生学的研究