Blastoderm[blas′tō-derm, -tō-der′ma]

Type:Term

Definitions
1. The thin, disc-shaped cell mass of a young embryo and its extraembryonic extensions over the surface of the yolk; when fully formed, all three primary germ layers (ectoderm, endoderm, and mesoderm) are present.

Synonyms
germ membrane , membrana germinativa

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