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what is embryonic layers?
The science of embryology within the first 17 days of the embryonic stage, three germ layers develop from which all organs and tissues originate.one of the three layers of cells in the embryo: the endoderm, the mesoderm, and the ectoderm. From these layers of cells arise all of the structures and organs and parts of the body. 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.

The three embryonic germ layers are the endoderm, mesoderm, and ectoderm.

During the embryonic development, the growing fetus passes in a highly accelerated speed through all the evolutionary stages from a single celled organism to a complete human being (the ontogenetic development repeats the phylogenetic development).


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