The endoderm germ layer basically consists of the innermost portions of our body and that includes or the majority of the epithelial layer of our body. So recall that the epithelial layer of the mouth and the amus is formed from the actoderm but the rest of our digestive tract and the rest of our digestive system is formed from the endoderm. So the epithelium of the stomach, the small and large intestine are all formed from the endoderm. And not only that, but as the embryo actually develops our endodermal cells basically create algorithms that eventually form the accessory organs of our digestive system and that includes things like the liver, which forms the bile and the bile eventually stored inside the gallbladder. So the gallbladder is also formed from the endoderm germ layer and we form the pancreas because as we know the pancreas produces many of the digestive enzymes that are used by that digestive system. So essentially the entire digestive system, not including the mouth and the anus, is formed from the endoderm germ layer.