title: Origin of blood supply to sinoauricular and atrioventricular node.
mesh_terms: D001158:Arteries / Q000033:anatomy & histology; D001283:Atrioventricular Node / Q000033:anatomy & histology*; D001466:Barium Sulfate; D003326:Coronary Circulation; D005260:Female; D006329:Heart Conduction System / Q000033:anatomy & histology*; D006801:Humans; D007269:Injections, Intra-Arterial; D008297:Male; D012849:Sinoatrial Node / Q000033:anatomy & histology*
chemical_list: D001466:Barium Sulfate