Cardiac conducting system - Sinoatrial (SA) node normally generates the action potential, i.e. the electrical impulse that initiates contraction. - The SA node excites the right atrium (RA), travels through Bachmann’s bundle to excite left atrium (LA). - The impulse travels through internodal pathways in RA to the atrioventricular (AV) node. - From the AV node, the impulse then travels through the bundle of His and down the bundle branches, fibers specialized for rapid transmission of electrical impulses, on either side of the interventricular septum. - Right bundle branch (RBB) depolarizes the right ventricle (RV). - Left bundle branch (LBB) depolarizes the left ventricle (LV) and interventricular septum. - Both bundle branches terminate in Purkinje fibers, millions of small fibers projecting throughout the myocardium. #Anatomy #Cardiology #Cardiac #Heart #Conduction #Pathways
