in left side of heart left cardiac atrium http://upload.wikimedia.org/wikipedia/commons/2/20/Diagram_of_the_human_heart_%28cropped%29.svg https://github.com/obophenotype/uberon/wiki/Modeling-paired-structures-Design-Pattern The tetrapod clade develops a complete atrial septum and loses the fifth aortic arch altogether.[well established][VHOG] BTO:0001702 left atrium of heart atrium sinistrum cardiac left atrium left atrium uberon Wikipedia:Left_atrium XAO:0003191 UMLS:C0225860 AAO:0010247 left cardiac atrium OpenCyc:Mx4rkJN1AagEEdudWQACs5b6Bw MA:0000074 heart left atrium The chamber of the heart that receives blood from the lungs[XAO:EJS]. Left cardiac chamber which is continuous with the pulmonary venous trunk.[FMA] UBERON:0002079 NCIT:C12869 SCTID:244387002 OpenCyc:Mx8Ngh4rvgIFoJwpEbGdrcN5Y29ycB4rDJ89oqgPEdudWQACs5b6Bw A cardiac atrium that is in the left side of the heart. It receives oxygenated blood from the pulmonary veins, In mammals this is pumped into the left ventricle, via the Mitral valve. EMAPA:17315 galen:LeftAtrium FMA:7097 EHDAA2:0000275 VHOG:0000369 cardiac atrium left cardiac chamber