Scanning Electron Microscopic Observations on the Taste Pores and Taste Hairs in Rabbit Gustatory Papillae

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  • カイウサギ味覚乳頭の味孔と味毛の走査電子鏡的観察
  • カイウサギ ミカク ニュウトウ ノ ミコウ ト ミモウ ノ ソウサ デンシキョウテキ カンサツ エイブン

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The taste pores and taste hairs of the papillae foliatae and circumvallatae in the rabbit's tongue were observed under the scanning electron microscope. The animals were perfused with buffered glutaraldehyde through the A. carotis communis and the papillae were post-fixed with buffered osmium tetroxide.<br>1. The taste pores were distributed more frequently on the top of the undulating epithelial surface lining the papilla groove, and opened in the form of circular crater with a relatively uniform diameter.<br>2. Each pore was surrounded by 3 to 5 cell bodies arranged side by side to form a ring.<br>3. Two types of taste hairs were found: the one occupied the major part of the pore and corresponded to the common taste hairs or microvilli in its size and shape and its location in the pore, while the other was a club-like projection, only one to three in number, and it extended out of the free margin of the pore an unusually long and thick stem with its top generrally swollen.<br>4. Development of the hairs in papillae circumvallatae was not so conspicuous as in papillae foliatae and the occurrence of the club-like projection was correspondingly very seldom.<br>5. The club-like projection is considered to correspond to the ending of the dark cell or type III cell which MURRAY and MURRAY et al. have reported with sectional views by transmission electron microscopy.

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