ニホンカモシカとオオツノヒツジの舌乳頭とその結合織芯の立体構造に関する比較解剖学的研究

DOI 被引用文献12件 参考文献40件

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  • Comparative Anatomical Studies on the Stereo Structure of the Lingual Papillae and Their Connective Tissue Cores in the Japanese Serow and Bighorn Sheep.

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Lingual papillae and the connective tissue core (CTC) of Japanese serow and Bighorn sheep, which belong to the grass eating animals of artiodactyla, were studied by light and scanning electron microscopies and compared to those of other animal species. Concerning the external form of filiform papilla, both species had a thick main process and several slender small processes. The CTC of the filiform papillae of Japanese serow showed only a U-shaped arrangement of slender protrusions, while that of Bighorn sheep consisted of numerous protrusions arranged in a U-shape but with several posterior protrusions fused with each other. The CTC of the fungiform papillae was columnar in shape and had several shallow hollows for taste buds in both species. Large conical papillae were found on the lingual prominence and their CTCs were covered with numerous small spines of secondary CTC. The number of vallate papillae was about 20 in Japanese serow with several in Bighorn sheep and showed a U-shaped arrangement in the posterior area of the lingual prominence. Numerous taste buds were distributed in the grooved side epithelium of the central vallate papillae, and numerous serous gland ducts opened to the base of the groove in both species. Foliate papillae were not found and the surface of the lingual root was flat and smooth with mucous glands in the lamina propria in both species.<BR>From the above results, the CTC of filiform papillae of Japanese serow was very similar to that in rabbits which showed a simple U-shaped arrangement. The CTC of the filiform papillae of Bighorn sheep had an intermediate stereo structure between Japanese serows and pronghorns. It is thought that these structures became more complicated from Japanese serow to Bighorn sheep, Pronghorns, Rocky mountain goats and to Shiba goats and finally fused type of cattle in artiodactyla.

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