A post-MORULA preimplantation mammalian embryo that develops from a 32-cell stage into a fluid-filled hollow ball of over a hundred cells. A blastocyst has two distinctive tissues. The outer layer of trophoblasts gives rise to extra-embryonic tissues. The inner cell mass gives rise to the embryonic disc and eventual embryo proper.
Synonyms: Preimplantation Embryo, Embryo, Preimplantation, Blastocyst, Embryos, Preimplantation, Blastocysts, Preimplantation Embryos
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74 ,Mammalian only; non-mammalian, use BLASTULA; /transpl: coordinate BLASTOCYST (NIM with no qualifiers) + EMBRYO TRANSFER (IM); do not confuse with BLASTOCYTES see BLASTOMERES
identifier
D001755
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