片语
extraembryonic ectoderm[胚]
extraembryonic structure胚外结构
extraembryonic mesoderm[胚] 胚外中胚层
extraembryonic coelom[胚]
extraembryonic membranes[胚] 胚外膜
extraembryonic circulation胚外循环
extraembryonic mesoblast胚外中胚层
extraembryonic vessel胚外血管
extraembryonic endoderm[胚]