embryonic disk

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human embryonic development

formation of the neural tube in prenatal development

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embryonic disk

biology

Also known as: embryonic shield

Learn about this topic in these articles:

nervous system development

In human nervous system: Neuronal development
…into what is called the embryonic disk. The embryonic disk soon acquires three layers: the ectoderm (outer layer), mesoderm (middle layer), and endoderm (inner layer). Within the mesoderm grows the notochord, an axial rod that serves as a temporary backbone. Both the mesoderm and notochord release a chemical that instructs…
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