part of part of heart embryonic structure bulbus cordis http://upload.wikimedia.org/wikipedia/commons/c/c9/Gray466.png UBERON:0004706 FMA:70300 EMAPA:16333 primitive right ventricle endocardium Wikipedia:Bulbus_cordis uberon UMLS:C1284055 A pear shaped chamber that functions as a capacitor, maintaining continuous blood flow into the gill arches. The bulbus arteriosus has three distinct layers. Hu et al. 2000.[TAO] 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 TODO - check relationship to bulbus arteriosus