| Lateral plate mesoderm | |
|---|---|
 Transverse section of a chick embryo of forty-five hours' incubation. * Axial mesoderm: yellow, at notochord. * Paraxial mesoderm: red, at somite. * Intermediate mesoderm: purple, near Wolffian duct. * Lateral plate mesoderm: purple, divided into "Somatic mesoderm" and "Splanchic mesoderm". | |
 Diagram of vertebrate embryo showing divided lateral plate mesoderm forming the intraembryonic coelom. Somatic mesoderm at outer layer, splanchnic at inner layer. | |
| Details | |
| Carnegie stage | 9 |
| Precursor | Mesoderm |
| Gives rise to | Somatopleure, splanchnopleure |
| Identifiers | |
| Latin | mesoderma laminae lateralis |
| TE | plate mesoderm_by_E5.0.3.0.0.0.2 E5.0.3.0.0.0.2 |
| Anatomical terminology | |
The lateral plate mesoderm is the mesoderm that is found at the periphery of the embryo. It is to the side of the paraxial mesoderm, and further to the axial mesoderm. The lateral plate mesoderm is separated from the paraxial mesoderm by a narrow region of intermediate mesoderm. The mesoderm is the middle layer of the three germ layers, between the outer ectoderm and inner endoderm.
During the third week of embryonic development the lateral plate mesoderm splits into two layers forming the intraembryonic coelom.
The outer layer of lateral plate mesoderm adheres to the ectoderm to become the somatic or parietal layer known as the somatopleure. The inner layer adheres to the endoderm to become the splanchnic or visceral layer known as the splanchnopleure.