Ectoderm | Epidermis, Neural Crest & Embryonic | Britannica
https://www.britannica.com/science/ectoderm
WEBEctoderm, the outermost of the three germ layers, or masses of cells, which appears early in the development of an animal embryo. In vertebrates, ectoderm subsequently gives rise to hair, skin, nails or hooves, and the lens of the eye; the epithelia (surface, or lining, tissues) of sense organs,
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