THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -It sends the electrical impulses that start the heartbeat. The SA node is in the upper part of your heart’s right atrium.

Detailed explanation-2: -Conduction System The sinoatrial (SA) node occupies a 1-cm2 area on the lateral surface of the junction of the superior vena cava and right atrium near the crista terminalis.

Detailed explanation-3: -The node is located in the floor of the right atrium, occupying the apex of the triangle of Koch. Via the penetrating atrioventricular bundle, this slowly conducting node forms the only myocardial connection between the atria and ventricles.