But the epithelium of the mouth and the anus are in fact formed from the actoderm germ layer. Now we also form the epithelium of the pituitary gland found in the brain as well as the penial gland. And that makes sense because these structures are found close to our nervous system inside our brain. Now remember on top of our kidneys we have this type of hormonal gland known as the adrenal gland and we have the adrenal medulla and the adrenal cortex. So the adrenal medulla portion, the inner portion of that adrenal gland is actually formed from the ectoderm. And we'll see in just a moment that the other portion, the adrenal cortex is formed from the mesoderm germ layer.