EntityQ660498· pop 39· linked from 199 articlesgerm layerSign in to saveprimary layer of cells in embryonic developmentConnectionsgastrulationEntityprimitive streakEntitylungEntityorganEntityPoriferaEntityCtenophoraEntitysmooth muscle tissueEntitycleavageEntityhuman embryonic developmentEntityinner cell massEntityDiploblastyEntityTriploblastyEntityAnimaliaEntitybrainEntitynoseEntitycellEntityliverEntityboneEntitymouthEntitystomachEntityCategoriesDevelopmental biologyEmbryologyGastrulationGerm layers