母体腺体母体血管蜕膜血管羊膜腔胚外体腔胚盘胚外内胚层06020000eE细胞滋养层胚外体腔胚总动画\胚外体腔.wmv
胚外内胚层 胚盘 胚外体腔 羊膜腔 母体腺体 母体血管 蜕膜血管 细胞滋养层 胚外体腔 胚总动画\胚外体腔.wmv
AreaofprochordalplateCutedgeofamnionWallofyolksacPrimitivestreakEpiblastHypoblast总结：2ndweek--Periodoftwos:2germlayers2trophblastlayers2 cavities
总结： 2nd week - Period of twos: 2 germ layers 2 trophblast layers 2 cavities