The<unk>  most frequently arises as an distal<unk>  from posterolateral artery off of the right coronary artery, but occasionally  the atrioventricular node receives blood from the circumflex<unk>  of left coronary artery.
Atrioventricular nodal branch
Bundle of Kent
Atrioventricular node
Sinoatrial node
Interventricular septum
Atrioventricular canal
Interatrial septum
Coronary sulcus