part of part of has part has part has_part composed primarily of musculature of body heart cardiac muscle tissue myocardium heart myocardium VHOG:0000083 TAO:0001319 XAO:0000065 EHDAA2:0004150 CALOHA:TS-0440 The middle layer of the heart, comprised mainly of striated cardiac muscle fibers. muscle of heart galen:Myocardium FMA:9462 NCIT:C12371 BTO:0000901 Wikipedia:Myocardium EV:0100022 GAID:173 MESH:D009206 MA:0000164 heart muscle UBERON:0002349 MAT:0000453 ZFA:0001319 SCTID:362012001 EFO:0000819 BSA:0000089 cardiac muscle AAO:0010410 RETIRED_EHDAA2:0001220 EDITOR_NOTE TODO - check 'Myocardum proper' in FMA. We superclass the more generic class for now. FMA has is_a muscle layer - should we add this? ZFA and BTO both have is_a 'cardiac muscle' (tissue?). But in U we also follow FMA and have cardiac muscle tissue of myocardium (there is also Fibrocollagenous connective tissue of myocardium), which would be identical (see issue-10). Note that GO also treats left/right ventricular cardiac muscle tissue synonymous with ventricular myocardium conducting system of heart heart layer layer of muscle tissue