AV node

The AV node receives impulses from the SA node. The AV node is located in the interatrial septum near the opening of the coronary sinus. The AV node slows the impulse so that it reaches the ventricles after it has reached the atria.

The bundle of His originates in the AV node. It conducts impulses to the right and left ventricles.

In the right ventricle, the moderator band (septomarginal trabecula) contains the right bundle branch.

Impulses pass from the right and left bundle branches to the papillary muscles and ventricular myocardium.

Atrioventricular node (AV node)

Left atrium

Inferior vena cava

Right atrium

Right ventricle

Superior vena cava

His bundle

Left ventricle

Bundle branches

Pulmonary veins

Purkinje fibers

Inferior vena cava

Purkinje fibers

His bundle

Right atrium

Left ventricle

Right ventricle

Bundle branches

Atrioventricular node (AV node)

Left atrium

Pulmonary veins

Superior vena cava

Sinoatrial node (SA node)

Figure lll-2-19.The Cardiac Conduction System

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