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. Finally the hour covering of our teeth known as the tooth enamel is formed from the actoderm germ layer as well. So all of these structures and organs and systems are formed from the actoderm germ layer these light purple cells shown in the diagram. Now let's move on to these middle red cells that make up the mesoderm germ layer.