The Evolution of Man — Volume 1

· 1919

ARCHI-: (in compounds) the first or typical--as, archi-cytula, archi-gastrula, etc. BLAST-: (in compounds) pertaining to the early embryo (blastos = a bud); hence:-- Blastoderm: skin (derma) or enclosing layer of the embryo. Blastosphere: the embryo in the hollow sphere stage. Blastula: same as preceding. Epiblast: the outer layer of the embryo (ectoderm). Hypoblast: the inner layer of the embryo (endoderm).…

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