The mesoderm forms the muscular and the skeletal system as well as the cardiovascular system, the excretory system and the reproductive system while the ectoderm is what forms the skin as well as the nervous system. Now, before these blue cells can actually organize themselves and arrange themselves and differentiate into the cells that ultimately make up the central and the peripheral nervous system of our body, what must happen is a structure known as the noticort must actually form. And the noticort is formed from the cells found in the Masodum germ layer. So the Masodermal cells basically form a structure known as the noticord. And a noticor is a cylindrical collection. It's a cylindrical rod of cells that runs all the way along the entire length of that developing embryo.