From Wikipedia, the free encyclopedia
The ectoderm is the start of a tissue that covers the body surfaces. It emerges first and forms from the outermost of the germ layers.
Generally speaking, the ectoderm differentiates to form the Nervous system, Epidermis, and the outer part of integument.
In vertebrates, the ectoderm has three parts: external ectoderm (also known as surface ectoderm), the neural crest, and neural tube. The latter two are known as neuroectoderm.
Section through ovum imbedded in the uterine decidua
