Concept
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Gastrulation
![Gastrulation](../../../../../../../../../figures.boundless-cdn.com/33595/full/dvomfiitle69dwnzguve.jpg)
Gastrulation
Formation of the three primary germ layers occurs during the first two weeks of development. The embryo at this stage is only a few millimeters in length.
This is a diagram of the formation of the three primary germ layers—ectoderm, mesoderm, and endoderm—that occurs during the first two weeks of development. The embryo at this stage is only a few millimeters in length.
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