As we'll see in just a moment the inner layer of the skin known as the dermis is actually formed from the mesoderm layer. Now what other organs found on the outside and the inside are also formed from the exoderm? Well, basically we have sensory organs. Not only are the sensory cells on the skin formed from the exoderm but the lens of the eye and the cornea of the eye are also formed from the ectoderm. Now we also form the epithelium of the mouth and the anus from the ectoderm. The majority of the digestive system as we'll see in just a moment is actually formed from the endoderm layer.