| prostomial mesoderm | Mesoderm that arises in lower vertebrates by continued proliferation at the lateral lips of the blastopore. (05 Mar 2000) |
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| secondary mesoderm | Mesoderm derived from the primitive streak and lying between the ectoderm and endoderm. Synonym: secondary mesoderm. (05 Mar 2000) |
| somatic mesoderm | That portion of the embryonic mesoderm that is associated with the body wall and is divided from the splanchnic visceral) mesoderm by the coelomic cavity. (18 Nov 1997) |
| somitic mesoderm | Mesoderm derived from cells situated in or derived from somites. (05 Mar 2000) |
| splanchnic mesoderm | The layer of lateral plate mesoderm adjacent to the endoderm. (05 Mar 2000) |
| intermediate mesoderm | A continuous band of mesoderm between the segmented paraxial mesoderm medially and the lateral plate mesoderm laterally; from it develops the nephrogenic cord. (05 Mar 2000) |
| intraembryonic mesoderm | Mesoderm derived from the primitive streak and lying between the ectoderm and endoderm. Synonym: secondary mesoderm. (05 Mar 2000) |
| extraembryonic mesoderm | Extraembryonic ectoderm cells or tissues which, though derived from the zygote, are not part of the embryo proper and along with the extraembryonic mesoderm form the foetal membranes (e.g., amnion). Synonym: primary mesoderm. (05 Mar 2000) |
| lateral mesoderm | The peripheral thinned-out portion of intraembryonic mesoderm which is continuous with the extraembryonic mesoderm beyond the margins of the embryonic disk; in it develops the intraembryonic celom. Synonym: lateral mesoderm. (05 Mar 2000) |
| lateral plate mesoderm | The peripheral thinned-out portion of intraembryonic mesoderm which is continuous with the extraembryonic mesoderm beyond the margins of the embryonic disk; in it develops the intraembryonic celom. Synonym: lateral mesoderm. (05 Mar 2000) |