An embryo at the stage following the blastula,consisting of a hollow,two-layered sac of ectoderm and endoderm surrounding an archenteron that communicates with the exterior through the blastopore.
英
美
释义
原肠胚一种囊胚之后的胚胎,含有中空、两层的外胚层和内胚层,包围着通过胚孔跟外界交流的原肠。
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