Figure 84b

Animated illustration of the cardiac excitation wave originating in the sinus node (SN) and spreading rapidly in succession over the right atrium (RA), Bachmannís Bundle (BB), the left atrium (LA), then the atrioventricular node (AV), bundle of His and Purkinje fibers, to the membraneous and muscular interventricular septum (IVS), and finally to the walls of the right (RV) and left ventricles (LV) through multiple branchings.