Main Page | See live article | Alphabetical index The endoderm is one of the three germ layers of the developing embryo, the other two being the ectoderm and the mesoderm. The endoderm gives rise to various tissues including the gastrointestinal tract and endocrine glands. This article is a stub. You can help Wikipedia by fixing it. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.