Atrioventricular branches

The atrioventricular branches of the right coronary artery is a termed used in the Terminologia Anatomica 1 but not kept in the TA2 as it remains quite unclear :

• For some sources, they refer to the posterolateral segmental arteries (also called posterolateral branches or right posterolateral branches) that arise from the distal right coronary artery as it courses in the posterior atrioventricular groove after giving off the posterior descending artery at the crux of the heart. The anatomic definition from ACC/AHA standards describes the posterolateral segmental artery as "the distal continuation of the right coronary artery in the posterior atrioventricular groove after the origin of the right PDA" in right-dominant circulations. 

• For other sources, it is the distal portion of RCA (or circumflex branch) in atrioventricular groove

• And for many sources it is confused with the atrioventricular nodal branch of right coronary artery