part of part of overlaps overlaps embryo ectoderm embryonic structure lateral plate mesoderm somatopleure http://upload.wikimedia.org/wikipedia/commons/2/28/Gray16.png UMLS:C1519423 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]. EMAPA:16180 Wikipedia:Somatopleure UBERON:0004874 EHDAA:381 sources differ as to whether this is part-of or develops-from the LPM FMA:295566 NCIT:C34301 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/ EHDAA2:0001847 VHOG:0000557