Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to somatic mesoderm: Splanchnic mesoderm
the middle of the three primary germ layers of the embryo, lying between the ectoderm and entoderm; from it are derived the connective tissue, bone, cartilage, muscle, blood and blood vessels, lymphatics, lymphoid organs, notochord, pleura, pericardium, peritoneum, kidneys, and gonads. adj., adj mesoder´mal, mesoder´mic.
somatic mesoderm the outer layer of the developing mesoderm.
splanchnic mesoderm the inner layer of the developing mesoderm.
the mesoderm adjacent to the ectoderm in the early embryo, after formation of the intraembryonic celom; the limbs and body wall are derived, in part, from it.