Trophoblast

Science / Biology / Trophoblast: The outer layer of cells of a blastocyst that adhere to the endometrium during implantation.

Chorion

Science / Biology / Chorion: The two-layered structure formed from the trophoblast after implantation; secretes human chorionic gonadotropin. MORE

Blastocyst

Science / Biology / Blastocyst: The developmental stage of the fertilized ovum by the time it is ready to implant; formed from the morula and consists of an inner cell mass, an internal cavity, and an outer layer of cells (the trop MORE

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