ectodermOne of three so-called germ layers of tissue formed in the early development of a fertilized ovum (egg). It is the outer layer of the blastula and later differentiates, in most animals, into a skin or shell, a nervous system, lining tissue, parts of some sense organs, and various other tissues. Other germ layers are the endoderm and mesoderm. Related category• DEVELOPMENTAL BIOLOGYAlso on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History |