adjacent to adjacent to adjacent_to right cardiac atrium left cardiac atrium interatrial septum http://upload.wikimedia.org/wikipedia/commons/6/6c/Gray493.png VHOG:0000385 UMLS:C0225836 EHDAA:1896 A cardiac septum that divides the left and right atria of the heart. UBERON:0002085 EMAPA:17011 interatrial septal wall Wikipedia:Interatrial_septum galen:InteratrialSeptum SCTID:362016003 The partition separating the right and left atria of the heart. [TFD][VHOG] OpenCyc:Mx4rwGvku5wpEbGdrcN5Y29ycA OpenCyc:Mx4rpd49nLYEEduAAAACs2IKfQ uberon MA:0000084 EHDAA2:0000838 The tetrapod clade develops a complete atrial septum and loses the fifth aortic arch altogether.[well established][VHOG] FMA:7108 NCIT:C32818 atrial septum atrium septum cardiac septum