Superior lobar artery of right lung

The superior lobar artery of right lung (sometimes termed as ascending branch, high anterior trunk or truncus anterior) arises from the right pulmonary artery (RPA)  at the right lung hilum.

The superior lobar artery has a course which is anterior to the right upper lobe bronchus, and it usually terminates in the apical (A1) and anterior (A3) segmental arteries, both of which usually divide into paired subsegmental arteries and the posterior segment (A2 artery) has a quite variable pulmonary arterial supply.

Other common variants include trifurcation of the truncus anterior to supply the apical, anterior and posterior segments and 2 separate branches to the posterior segment. Occasionally there may be segmental supply to the upper lobe from the middle lobe or superior segmental right lower lobe artery. 

Branches of superior lobar artery:

• Apical segmental artery of right lung (A1)

• (Anterior segmental artery of right lung (A2))

• Posterior segmental artery of right lung (A3)