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Ectoderm
Organs derived from ectoderm.
Section through embryonic disk of Vespertilio murinus.
Gray's	subject #6 48
Days	16
MeSH	Ectoderm

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, and the epidermis (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

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