Embryology is the study of the development of embryos from the fertilization to fetus stage. Interestingly, most embryos look generally alike.
During embryonic development, embryos have three layers of tissue, or germ layers. These layers are called endoderm, mesoderm, and ectoderm.
Endoderm: innermost layer with flattened cells that develops digestive organs
Mesoderm: middle layer that develops skeleton, muscles, and blood system
Ectoderm: outer layer that helps form nervous system and lining of mouth, nails, and nosrils
There is also a DNA control layer that regulates genes and shows genes how to collaborate.
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