blastocyst https://upload.wikimedia.org/wikipedia/commons/7/72/Blastocyst_English.svg NCIT:C13739 SCTID:308837009 Wikipedia:Blastocyst GAID:1153 blastocystis MESH:D001755 EMAPA:36035 FMA:83041 UBERON:0000358 Gilbert fig11.32 has blastocyst has giving rise to ICM and trophoblast (which in this source is a synonym for trophectoderm) blastula EV:0100394 BTO:0001099 CALOHA:TS-0076 UMLS:C1281743 The mammalian blastocyst is a hollow ball of cells containing two cell types, the inner cell mass and the trophectoderm[GO]. EFO:0000295 embryonic structure