part of part of has part has part composed primarily of musculature of body heart cardiac muscle tissue myocardium AAO:0010410 BSA:0000089 BTO:0000901 CALOHA:TS-0440 EFO:0000819 EHDAA2:0004150 EMAPA:32688 EV:0100022 FMA:9462 GAID:173 MA:0000164 MAT:0000453 MESH:D009206 OpenCyc:Mx4ro36AFrCvEduAAAAOpmP6tw RETIRED_EHDAA2:0001220 Robust muscular tunic of the heart which forms the basic part of its walls. Its external surface is covered by the pericardium and its internal one by the endocardium. [Dorian_AF, Elsevier's_encyclopaedic_dictionary_of_medicine, Part_B:_Anatomy_(1988)_Amsterdam_etc.:_Elsevier][VHOG] TAO:0001319 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 The middle layer of the heart, consisting of cardiac muscle.[AAO] UBERON:0002349 UMLS:C0027061 VHOG:0000083 XAO:0000065 ZFA:0001319 cardiac muscle galen:Myocardium heart muscle heart myocardium muscle of heart myocardial the middle layer of the heart, comprised mainly of striated cardiac muscle fibers uberon conducting system of heart heart layer structure with developmental contribution from neural crest layer of muscle tissue