part_of part of part of develops_from develops from develops from embryo embryonic structure heart primordium cardiogenic plate The first recognizable structure derived from the heart field. VHOG:0000975 UBERON:0004139 cardiac crescent The first recognizable structure derived from the heart field uberon EMAPA:16106 (In vertebrates) The embryonic mesoderm is the source of both the cardiogenic plate, giving rise to the future myocardium as well as the endocardium that will line the system on the inner side.[well established][VHOG] cardiogenic crescent EHDAA2:0000215 myocardial plate heart rudiment TODO - check plate vs rudiment vs primordium vs endocardial tube. See XAO developing anatomical structure