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방사선조사가 태내백서의 설조직에 미치는 영향에 관한 전자현미경적 연구
한창근 大韓顎顔面 放射線學會 1983 Imaging Science in Dentistry Vol.13 No.1
The author observed the effects of 60CO irradiation on the development and subcellular structure of tongue tissue of the fetal rats. The lower left abdomen of mothers were exposed to radiation on 15½th day of gestation with 300R. The fetuses were removed on the 6hr, 14hr, 24hr, 48hr and 72hr after irradiation and the light microscopic and electron microscopic observations of the lingual epithelium, lamina propria and muscle layer were carried out. The results were as follows: 1. The irradiated fetuses showed the retardation of filiform papillae formation. 2. Epithelial cells revealed fusion and myelination of mitochondria, large autolysosomes, increased lipid droplets, retardation of tonofilaments and desmosome fomation. 3. In the lamina propria, undifferentiated cells showed bleb formation of nuclear membrane, pyknosis and fragmentation of nucleus, edema of cytoplasm and nucleus, increased autolysosomes, dilatation of cell membrane and cell necrosis. Also, collagenous fibril formation was inhibited by irradiation. 4. In the muscle layer, growth of myotubes was inhibited. Myotubes showed swelling of mitochondria, loss of mitochondrial cristae, autolysosomes, retardation of myofibril formation, and large vacuoles. Undifferentiated cells adjacent myotube contained pyknotic nucleus and autolysosomes. 5. Among the various tissues of tongue, it seems that mesenchymal cells were most radiosensitive.