Cardiac conduction

Atrioventricular (AV) node

AV bundle (of His)

Interatrial bundle

Internodal bundles

LA

Lateral ventricular wall

LV

RA

Right and left branches of AV bundle (bundle of his)

RV

Septum

Sinoatrial (SA) node (pacemaker)

Subendocardial fibers (purkinje fibers)