口腔颌面部开始发育的时间是A.胚胎发育第4周 B.胚胎发育第5周 C.胚胎发育第3周 D.胚胎发育第6周 E.胚胎发育第7周

作者: tihaiku 人气: - 评论: 0

问题口腔颌面部开始发育的时间是

选项 A.胚胎发育第4周 B.胚胎发育第5周 C.胚胎发育第3周 D.胚胎发育第6周 E.胚胎发育第7周

答案 C

解析面部的发育始于胚胎第3周，由上颌突、下颌突、额鼻突等十个面突生长、分化、联合而成。

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