part of part_of part of part_of develops_from develops from embryo embryo 胚胎 germ layer germ layer 胚层 A layer of cells produced during the process of gastrulation during the early development of the animal embryo, which is distinct from other such layers of cells, as an early step of cell differentiation. The three types of germ layers are the endoderm, ectoderm, and mesoderm. embryonic germ layer embryonic germ layers embryonic tissue germinal layer primary germ layer A layer of cells produced during the process of gastrulation during the early development of the animal embryo, which is distinct from other such layers of cells, as an early step of cell differentiation. The three types of germ layers are the endoderm, ectoderm, and mesoderm. embryonic germ layer embryonic germ layers embryonic tissue germinal layer primary germ layer 作为细胞分化的早期步骤，在动物胚胎的早期发育过程中原肠胚形成过程中产生的细胞层与其他这样的细胞层不同。三种类型的胚层是内胚层、外胚层和中胚层。 初生胚层 生发层 胚胎组织 胚胎胚层(embryonic germ layer) 胚胎胚层(embryonic germ layers) epiblast (generic) epiblast (generic) 外胚层（通用） germ layer / neural crest germ layer / neural crest 胚层/神经嵴