multi-tissue structure coelom EHDAA2 distingsuishes between the lumen, the lining, and the 'coelomic cavity', which despire it's name, is not a space - it is the aggregate of space plus lining. EHDAA2:0004731 The aggregate of the coelemic cavity lumen plus the membranes that line the lumen. UBERON:0011997 coelem coelomic coelomic cavity enterocoelom haemocoelom schizocoelom uberon