ectoderm

ectoderm /ec·to·derm/ (ek´to-derm) the outermost of the three primitive germ layers of the embryo; from it are derived the epidermis and epidermic tissues, such as the nails, hair, and glands of the skin, the nervous system, external sense organs and mucous membrane of the mouth and anus.ectoder´malectoder´mic

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ec·to·derm (kt-dûrm)

n.

The outermost of the three primary germ layers of an embryo, from which the epidermis, nervous tissue, and sense organs develop. Also called ectoblast.

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ecto·dermal, ecto·dermic adj.

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ectoderm

(ek´tdurm),
n the outermost of the three primary cell layers of an embryo. The ectoderm gives rise to the nervous system, the organs of special sense, the epidermis, and epidermal tissues such as fingernails, hair, and skin glands.

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ectoderm

the outermost of the three primitive germ layers of the embryo; from it are derived the epidermis and epidermal derivatives, such as the claws, hair and glands of the skin, the nervous system, external sense organs (eye, ear, etc.) and mucous membrane of the mouth and anus.