Concept
Version 6
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Cleavage, the Blastula Stage, and Gastrulation
Differentiation of germ layers
The three germ layers give rise to different cell types in the animal body: the ectoderm forms the nervous system and the outer layer of skin, the mesoderm gives rise to muscles and connective tissues, and the endoderm gives rise to the lining of the digestive system and other internal organs.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Fertilization and Early Embryonic Development. October 17, 2013."
http://cnx.org/content/m44846/latest/Figure_43_05_04.jpg
OpenStax CNX
CC BY 3.0.