part of part of develops_from primordium lateral plate mesoderm heart primordium AAO:0011044 BTO:0001887 Bilateral groups of cells consisting of three rows: one row of endocardial precursors medially and two rows of myocardical precursors laterally. The two populations fuse at the midline between 21 and 26 somites to form the heart rudiment or cone. Stainier 2001.[TAO] Bilateral groups of cells consisting of three rows: one row of endocardial precursors medially and two rows of myocardical precursors laterally. The two populations fuse at the midline to form the heart rudiment or cone. TAO:0000028 The fused aspects of ventral mesoderm, which have migrated from either side of the prechordal plate, and fused ventrally, just behind the cement gland. They will give rise to the endocardium at NF stage 27&28.[AAO] UBERON:0003084 UMLS:C1514450 XAO:0000336 ZFA:0000028 cardiac field fused heart primordium relationship loss: develops_from lateral mesoderm (TAO:0001065)[TAO] should probably be merged with heart rudiment. uberon primary heart field cardiovascular system cardiac mesoderm