KnowraBlastocystLinked fromLinked fromThe 16 pages that link to Blastocyst, each with the reason it gives.All 16Broader topic 10Related 3Narrower topic 3PlacentaNarrower topic: The placenta begins forming as the blastocyst implants in the uterus.TrophoblastNarrower topic: The trophoblast is the blastocyst’s outer layer.Inner cell massNarrower topic: The inner cell mass occupies one pole of this developmental stage.