Where is the AV node located?

Where is the AV node located?

• A. At the junction of the atria and ventricles on the anterior septum near the septal leaflet of the tricuspid valve
• B. On the posterior wall of the left atrium
• C. In the inferior wall of the right ventricle
• D. In the interventricular septum near the mitral valve

Answer: (A)

The AV node sits at the atrioventricular junction in the right atrial septum, specifically in the floor of the right atrium within the triangle of Koch near the coronary sinus opening and close to the septal leaflet of the tricuspid valve. This position lets atrial impulses slow down here before passing to the ventricles, coordinating the timing of atrial and ventricular contractions. The other suggested locations are not where the AV node resides—the left atrium’s posterior wall, the inferior wall of the right ventricle, and the interventricular septum near the mitral valve are not the typical AV node sites.

The AV node sits at the atrioventricular junction in the right atrial septum, specifically in the floor of the right atrium within the triangle of Koch near the coronary sinus opening and close to the septal leaflet of the tricuspid valve. This position lets atrial impulses slow down here before passing to the ventricles, coordinating the timing of atrial and ventricular contractions. The other suggested locations are not where the AV node resides—the left atrium’s posterior wall, the inferior wall of the right ventricle, and the interventricular septum near the mitral valve are not the typical AV node sites.