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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 layer of lateral plate mesoderm adjacent to the endoderm.
The inner layer of the lateral mesoderm. It becomes intimately associated with the endoderm, forming the splanchnopleure, from which the gut and the lungs and their coverings arise.
See also: mesoderm