Embryology...what is it? Well, Embryology is a science (obviously) that is based on the development of an embryo from fertilization. As you can see in the image above, in the very first of all our embryonic stages, we look very similar, almost identical. Within this development, there are three germ layers. These layers are known as endoderm, mesoderm, and ectoderm, endoderm being the innermost layer. The endoderm consists at first of flattened cells, and it develops the digestive organs and lungs.
Mesoderm is the middle germ layer and it is best known for helping develop the muscles, skeleton, and blood system. This layer appears in the third week of embryonic development and is formed through a process called gastrulation.
The third layer, or the exterior layer, is called ectoderm. It emerges and originates from the outer layer of germ cells. The word "ectoderm" literally means "outside" and "skin" in Greek. Go figure! Anyway, this layer helps form the nervous system. In other words, it forms the spine, peripheral nerves and brain. It also helps form the lining of mouth, anus, nostrils, sweat glands, hair and nails.
In embryology and the development of embryos, DNA interactions help control and show how genes operate. It also opens the information of their network control within the genes.
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