transformation of luminal space of coelemic cavity lumen The cavity within the body of all animals higher than the coelenterates and certain primitive worms, formed by the splitting of the embryonic mesoderm into two layers. In mammals it forms the peritoneal, pleural, and pericardial cavities. UBERON:0002323 AEO:0000186 NCIT:C25444 space of body compartment main body cavity uberon coelomic cavity lumen FMA:85006 coelomic cavity SCTID:361348008 ZFA:0001438 EHDAA2:0000267 RETIRED_EHDAA2:0003186 TAO:0001438 BTO:0001707 galen:BodyCavity UMLS:C0333343 anatomical cavity future coelemic cavity lumen coelom