a nonsegmented mass of mesoderm on the lateral periphery of the embryonic disc; it forms the somatopleuric (parietal) and splanchnopleuric (visceral) mesoderm.
lat·er·al plate
(lat'ĕr-ăl plāt) A nonsegmented mass of mesoderm on the lateral periphery of the embryonic disc.
lateral plate
the mesoderm in the ventrolateral position in the vertebrate embryo.