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blastula vs. blastocyst

blastula

noun

Embryology.

plural

blastulas, blastulae 

  1. the early developmental stage of an animal, following the morula stage and consisting of a single, spherical layer of cells enclosing a hollow, central cavity.

blastocyst

noun

Embryology.

  1. the blastula of the mammalian embryo, consisting of an inner cell mass, a cavity, and an outer layer, the trophoblast.