... extraeconomiccompulsion经济外强制 经济外强制 extraembryonic胚外的 extraembryoniccapillarynetwork胚外毛细血管网 ...
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extraembryonic coelom [胚] 胚外体腔 ; 外胚胎腔
extraembryonic endoderm [胚] 胚外内胚层
extraembryonic ectoderm [胚] 胚外外胚层
extraembryonic blastoderm 胚外胚盘
extraembryonic somatopleuric mesoderm [胚] 胚外体壁中胚层
extraembryonic field [胚] 胚外区
Exocoelom Extraembryonic coelom 胚外体腔
extraembryonic mesoderm [胚] 胚外中胚层
Extraembryonic mesoderm migrates through primitive streak to the presumptive yolk sac between days 6.5 and 7.0 of gestation.
胚外中胚层在妊娠的第6.5至7.0天之间通过原始条带迁移到推测的卵黄囊。
Tetraploid cells are preferentially allocated to the extraembryonic tissues, such as placenta, rather than the fetus itself.
而在胎儿本身的组织中，很少能找到四倍体细胞的存在。
Ultrasonography had great advantage over MRI in showing yolk sacs, amniotic sacs, extraembryonic coelom and embryocardia-beats ( P< 0.005).
MRI显示早早孕、早中期的卵黄囊、胚外体腔、羊膜囊及胎心搏动不如超声（P<0 .0 0 5 ） ；
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