part of part of has part has part embryo ectoderm lateral plate mesoderm somatopleure A structure created during embryogenesis when the lateral mesoderm splits into two layers - the outer (or somatic) layer becomes applied to the inner surface of the ectoderm, and with it forms the somatopleure.[WP]. EHDAA2:0001847 EHDAA:381 EMAPA:16180 FMA:295566 Gives rise to the paired appendages in jawed vertebrates. a persistent somatopleure through the redistribution and expansion of the lateral plate mesoderm is a synapomorphy for gnathostomes and a critical step in generating a novel developmental module with dramatic evolutionary potentia (Tulenko et al. 2012) http://burkelab.research.wesleyan.edu/current-projects/lamprey/ UBERON:0004874 UMLS:C1519423 VHOG:0000557 sources differ as to whether this is part-of or develops-from the LPM uberon developing anatomical structure