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Updated: May 5, 2025
The inner layer or the invaginated part of the blastoderm, which immediately encloses the gut-cavity is the entoderm, the inner or vegetal germ-layer, from which develop the wall of the alimentary canal and all its appendages, the coelom-pouches, etc. The cells of the entoderm are much larger, darker, and more fatty than those of the ectoderm, which are clearer and less rich in fatty particles.
On the other hand, the vegetal systems of organs arise for the most part from the INNER primary germ-layer, the visceral layer. In the more advanced animal body there is so much interlacing and displacement of the various parts that it is often very difficult to indicate the sources of them.
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