part of part of heart embryonic structure bulbus cordis UBERON:0004706 FMA:70300 EMAPA:16333 primitive right ventricle endocardium Wikipedia:Bulbus_cordis SCTID:361525002 EHDAA:768 EHDAA:438 A transient fetal dilation of the distal (or cranial) heart tube located where the arterial trunk joins the ventral roots of the aortic arches. EHDAA2:0000197 NCIT:C34114