| intraembryonic | Within the embryonic body, e.g., the portion of the umbilical vein within the embryo (in contrast to the portion in the umbilical cord which is discarded at birth). Compare: extraembryonic. (05 Mar 2000) |
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| intraembryonic mesoderm | Mesoderm derived from the primitive streak and lying between the ectoderm and endoderm. Synonym: secondary mesoderm. (05 Mar 2000) |