Anatomy and Electrophysiology
Cardiac Conduction System
The impulse originates in the SA node. The SA node has specialized cells that act as the physiologic pacemaker of the heart. The internodal pathways transmit the impulse from the SA node to the AV node where the impulses are slowed down. From the AV node, the impulse travels to the Bundle of His, then the signals go to the left and right bundle branches. The impulsees are then propelled through the Purkinjie Fibers which directly inervate the myocardial cells.
Animation of Instrinsic Conduction of the Heart
Self Test – Matching Activity for Cardiac Conduction System