An electron microscopic study on the development of mouse cheek.
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概要
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In order to elucidate the pathogenesis of the buccal area deformity, normal development of the mouse cheek, especially the chronological changes of the area between maxillary and mandibular process (AMM) from the 9.0th day to the 14.5th day of gestation (plug day=0), was investigated by light and electron microscopy. On the 9.0-9.5th day of gestation, the first branchial arch connected directly to the fronto-nasal process and its surface epithelium was simple cuboidal and had many short microvilli. On the 10.0 th day, the maxillary process began to swell up from the first branchial arch. The epithelium between and maxillary mandibular process was flattened and its cellular margins were accentuated by the presence of numerous microvilli. There were two kinds of cells, one had numerous microvilli and the other had not. On the 10.3th day, the arrangement of the AMM cell layer was temporally random and the apoptosis was observed characteristically. After the 11.0th day, squamous peridermal cells, of which boundaries were clearly demarcated with microvilli, appeared at surface of the epithelium. Beneath the periderm, cuboidal epithelial cells arranged as one or two cell layers. After the 14.0th day, the epithelium became striated and squamous.<BR>Although the epithelial arrangement became temporally random at the 10.3th day, AMM epithelium existed as the compact mass and the mesenchymal cell did not migrate into the epithelium during AMM development. The phenomena which were reported to occur characteristically at the epithelial fusion during the development of the primary or secondary palate were not observed in this study.<BR>From these results, the development of the cheek is not from the epithelial fusion between maxillary and mandibular process but from the proliferation and the differentiation of the cells both of maxillary and mandibular process including mesenchymal cells, and the cheek develops through the relative facial development.
- 社団法人 日本口腔外科学会の論文
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- An electron microscopic study on the development of mouse cheek.