NUERULATION Process where the neural tube forms. It becomes the central nervous system. 3 important layers to remember -Ectoderm, mesoderm and endoderm Endoderm gives rise to the lining of the central nervous system (GIT) and the lining of the airways. Ectoderm- gives rise to the nervous system and the skin Mesoderm- form the connective tissues; bones, tissue and muscles. Notochord is lso important.