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Blastocoel , blastocoelic or primary body cavity refers to the fluid filled cavity of the blastula . The blastocoel arises during ontogenesis in the final stage of the furrow . In the further course of ontogenesis, the blastocoel is almost completely displaced by the invaginating endoderm (inner cotyledon) in the course of gastrulation ( germ layer formation ) . The cavity of the blastula is not homologous to the blastocyst cavity of a blastocyst .


See also