part of has part surrounded by existence starts during existence ends during blastoderm cell morula GAID:1295 EHDAA2:0000005 Wikipedia:Morula NCIT:C34212 SCTID:361474003 morula (2-16 cells) A spherical embryonic mass of blastomeres formed before the blastula and resulting from cleavage of the fertilized ovum. FMA:292334 BTO:0001508 MESH:D009028 zona pellucida cleavage stage embryo conceptus