Morphology of the sinus and atrioventricular nodes and their innervation.
D001283:Atrioventricular Node / Q000033:anatomy & histology* / Q000502:physiology; D004562:Electrocardiography; D006329:Heart Conduction System / Q000033:anatomy & histology*; D006801:Humans; D008854:Microscopy, Electron; D012849:Sinoatrial Node / Q000033:anatomy & histology* / Q000502:physiology