【摘要】 目的　观察上颌骨及下颌骨的胚胎发育。方法　 采用Noback氏法将胎儿制成透明标本 ,用茜素红染色观察。结果　 上颌骨各部骨化时间为 8～ 2 6周 ,最早骨化部位为上颌体 ,最晚为上颌窦裂口。下颌骨各部骨化时间为 8～ 36周 ,骨化部位最早的为下颌体 ,最晚的为颏结节。结论 　至胚胎发育的第 4 0周上颌骨除牙槽突、泪沟、眶下孔、上颌结节外 ,其余各部均已骨化。下颌骨除颏隆凸、牙槽轭、咬肌粗隆、翼肌粗隆、下颌舌骨肌线外 ,其余各部均已骨化。更多还原

【Abstract】 Objective To observe the development of fetus’ maxilla and mandibula.Methods With Noback’s method,every fetus was made transparent and then dyed dark red by the Alizarin red.Results The occuring time of ossification of maxilla lasted 8-26 weeks.The first part of the ossification was the body of maxilla, and the last part of the ossification was maxillary.The occuring time of the ossification of mandibula lasted 8-36 weeks.The first part was corpus mandibulae,and the last part was tuberculum.Conclusion In the 40th week,maxilla had been completely ossificated except processus alveolaris,lacrimal sulcuss,foramen infra-orbitale and maxillary tuber.Mandibula had been completely ossificated except protuberantia mentalis,juga alveolaria,tuberositas pterygoidea,tuberositas masseterica,and Lin mylohyoidea.更多还原