胚外体壁中胚层 [胚] extraembryonic somatopleuric mesoderm

胚外中层 extra-embryonic mesoderm

胚外中胚层 [胚] extraembryonic mesoderm

下轴外中胚层 hypomere

外中胚层原始细胞 ectomesoblast

胚外脏壁中胚层 [胚] extraembryonic splanchnopleuric mesoderm