One of the mysteries of the English language finally explained.
Mesenchyme that is derived from ectoderm or the neural crest rather than from mesoderm. Also: the outer layer of blastoderm before its differentiation into ectoderm and mesoderm.
Late 19th century; earliest use found in Journal of the Royal Microscopical Society. From German Mesektoderm from Meso- + Ektoderm.
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