ラット口蓋味蕾の味孔の形成に関する電顕的研究
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概要
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The development of the taste pore which is the receptor of gustation in the soft palate of the rat was observed by the optical, scanning electron and transmission electron microscopy. The specimen were excised from 60 Sprague Dawlay rats at birth, 1 day, 3 days, 5 days and 14 days after birth, and highly differentiated taste buds were selected. The results obtained were as follows, 1. Under the optical, scanning electron and transmission electron microscope, the taste pore in the soft palate of the rat didn't open at birth. And then it opened at 1 day after birth, and with the development of the taste buds, the taste pore was formed at 14 days after birth. 2. In the process of forming of the taste pore, the microvilli reached to a higher level of the pore, but at 14 days after birth it terminated within the pore. From at birth to 14 days after birth, microgranules and vesicles were seen around the microvilli in the pore region, and they increased with the progress of the formation of the taste pore. 3. The epithelium which covered the taste buds turned into thin type, and the intercellular gap became wide with the beginning of the formation of the taste pore. Subsequently desquamation was seen at the surface layer of the epithelium. 4. In the transmission electron microscopic observation, large amount of mitochondria, free ribosome and a small amount of rough surfaced endoplasmic reticulum, lipid granule, vesicle and substance like multivesicular body were seen in the cytoplasm of the taste cell immediately after birth before the taste pore opened. After 1 day after birth, these structures increased at the beginning of the formation of the taste pore. At the apex of the gustatory cell, microvilli were formed and they gathered and intruded into the taste pore. In the epithelium which covered the taste buds, formation of the taste pore was in progress before it opened, and cytoplasm in its epithelium was homogenous and nonstructured as a whole to the aged 5 days, and lysosome-like structures were seen in relatively large quantities and decreased slightly at postnatal 14 days. Since these structures could be seen in the taste pore, it is speculated that those structures closely participate in the formation of the taste pore.
- 九州歯科学会の論文
- 1988-12-25