为了建立国人胚胎发育的相关常数,促进胚胎发育,为临床监测胎儿发育状况提供依据,笔者根据全国胚胎专业组会议(1985年扬州会议)规定的方法和项目,对张家口市区各医院收集的汉族胎儿标本454例(其中5～9周14例,10～41周450例,均为自然、人工流产或难产致死的新鲜正常胚胎)测量了外形特征 In order to establish the relevant constants for embryonic development of the Chinese people, promote embryonic development, and provide basis for clinical monitoring of fetal development, the authors collected the Han nationality from hospitals in Zhangjiakou City according to the methods and projects stipulated by the National Embryological Experts Group Meeting (Yangzhou Conference in 1985). 454 cases of fetal specimens (including 14 cases at 5 to 9 weeks and 450 cases at 10 to 41 weeks, all of which were natural, abortive or dead-born dead normal embryos)