The splanchnopleure is a formed during embryogenesis when the lateral plate mesoderm splits into two layers. The inner (or splanchnic) layer adheres to the endoderm, and with it forms the splanchnopleure (mesoderm external to the coelom plus the endoderm).
See also somatopleure mesenchyme
References This article incorporates text in the public domain from page 50 of the 20th edition of Gray's Anatomy (1918)
External links digest-022—Embryo Images at University of North Carolina digest-023—Embryo Images at University of North Carolina Overview Archived 2010-06-24 at the Wayback Machine at Kennesaw State University