part_of part of part of has part has part has_part surrounds multi-tissue structure myocardium fibrous pericardium pericardial sac pericardium VHOG:0001280 MAT:0000454 BSA:0000090 UBERON:0002407 EHDAA:5376 CALOHA:TS-0761 NCIT:C13005 SCTID:181295003 EV:0100023 XAO:0004182 FMA:9869 ZFA:0000054 galen:Pericardium The combination of pericardial sac (a double-walled sac containing the heart and the roots of the great vessels) plus fibrous pericardium. BTO:0000717 MA:0000099 EFO:0000820 RETIRED_EHDAA2:0001443 Wikipedia:Pericardium GAID:569 AAO:0010817 MESH:D010496 heart plus pericardium