Tim Taylor is a senior writer at Innerbody Research focusing on human anatomy and physiology. Tim earned both his Bachelor of Science degree in Biology and his Master's degree in Teaching from the University of Pittsburgh.
The embryonic disc (or embryonic disk) results from the flattening of the embryoblast. It consists of two layers; an upper ectoderm which is closer to the amniotic cavity, and a lower endoderm which is near the blastocyst cavity. A short time later, a third layer called the mesoderm forms between the endoderm and ectoderm. These three layers are called the primary germ layers.
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