Question

what do you mean by embryonic layer or germ laye?r what is the signnificance of these layers?

Answer 1

Embryonic layer is commonly called as germ layer.

During development, morphogenetic processes rearrange the cells. Three principal laminae, known as the primary germ layers or embryonic layers develop from the inner cell mass by about two weeks after fertilization. The endoderm and the ectoderm are the first to develop. During the third week of gestation the mesoderm arises between the ectoderm and the endoderm. From these layers of cells arise all of the structures and organs and parts of the body. All three germ layers participate in formation of the functional organs and organ systems. The germ layers are no longer considered rigidly specific.