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A layer of cells in a vertebrate embryo, formed by association of part of the mesoderm with the endoderm and developing into the wall of the viscera.

[New Latin splanchnopleura : splanchno-, of viscera; see splanchnology + Greek pleura, side.]

splanch′no·pleu′ral (-plo͝or′əl), splanch′no·pleu′ric (-plo͝or′ĭk) adj.
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(3) Serosa (trophoderm or somatopleure)--the serosa encloses the other extra-embryonic cavities with their respective surrounding membranes and, together with the splanchnopleure of the allantois, represents the chorion, the three-layered fetal part of the placenta.