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[ek-tuh-durm] /ˈɛk təˌdɜrm/

noun, Embryology.
the outer germ layer in the embryo of a metazoan.
the outer germ layer of an animal embryo, which gives rise to epidermis and nervous tissue See also mesoderm, endoderm

1861, from ecto- + -derm. Coined by Prussian embryologist Robert Remak (1815-1865).

ectoderm ec·to·derm (ěk’tə-dûrm’)
The outermost of the three primary germ layers of an embryo, from which the epidermis, nervous tissue, and sense organs develop. Also called ectoblast.
ec’to·der’mal or ec’to·der’mic adj.
The outermost of the primary germ layers of an animal embryo. In vertebrates, the ectoderm gives rise to the epidermis and associated tissues (such as hair and sweat glands), enamel of the teeth, sense organs, nervous system, and lining of the nose, mouth, and anus. Compare endoderm, mesoderm.


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  • Ectodermal dysplasia

    ectodermal dysplasia n. Abnormal development or growth of tissues and structures that develop from the ectoderm.

  • Ectodermosis

    ectodermosis ec·to·der·mo·sis (ěk’tō-dər-mō’sĭs) n. pl. ec·to·der·mo·ses (-sēz) A disorder of an organ or tissue developed from the ectoderm.

  • Ectoentad

    ectoentad ec·to·en·tad (ěk’tō-ěn’tād’) adv. From without inward.

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