ANATOMY

Detailed explanation-1: -It is located at the junction of the crista terminalis in the upper wall of the right atrium and the opening of the superior vena cava. These cells have the ability to spontaneous generate an electrical impulse.

Detailed explanation-2: -The sinoatrial node (SAN), located in the right atrium, serves as the primary site for initiation of the normal heartbeat (sinus rhythm) (Figure 1).

Detailed explanation-3: -Sinoatrial node (SA node) is located on the wall of the right auricle/atrium, near the opening of the superior vena cava. It relays the impulse that starts a heart beat to the right ventricles with the help of special conducting fibres.

Detailed explanation-4: -The sinoatrial node is located in the upper part of the right atrium in the healthy heart, and serves as the natural pacemaker (Figure 1).

Detailed explanation-5: -The SA (sinoatrial) node generates an electrical signal that causes the upper heart chambers (atria) to contract. The signal then passes through the AV (atrioventricular) node to the lower heart chambers (ventricles), causing them to contract, or pump. The SA node is considered the pacemaker of the heart.