《英文msh词典》Embryos,Preimplantation
[入口词] Embryos,Preimplantation
[主题词] Blastocyst
[英文释义] Early preimplantation mammalian EMBRYO in the post-MORULA stage. Its structure consists of a TROPHOBLASTS-enclosed fluid-filled cavity with an inner cell mass. After EMBRYO IMPLANTATION,the inner cell mass of the blastocyst becomes the embryonic disc of the developing embryo.