lateral mesoderm


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lat·er·al plate mes·o·derm

the peripheral portion of intraembryonic mesoderm that is continuous with the extraembryonic mesoderm beyond the margins of the embryonic disc; it forms the somatic and splanchnic mesoderm between which develops the intraembryonic celom.
Synonym(s): lateral mesoderm

lateral mesoderm

Unsegmented mesoderm lying lateral to the intermediate mesoderm. In it develops a cavity (coelom), separating it into layers (somatic and splanchnic mesoderm).
Synonym: hypomere
See also: mesoderm
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