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According to the course of the conduits, the right lung is divided into 10 segments. The right upper lobe consists of 3 bronchopulmonary segments:
- The apical segment S1
- The posterior segment S2
- The anterior segment S3
Bronchus B3: The right upper lobe bronchus originates apicolaterally at an angle of 90° from the right main bronchus. In more than half of the cases, the upper lobe bronchus divides into an apical segmental bronchus, which contains the segmental bronchi B1 + B3, and a posterior B2 segmental bronchus, which runs slightly dorsolaterally apically.
Artery A3: The segmental arteries of the right upper lobe run with the 3 segmental bronchi and show great variability in terms of location and strength. The anterior trunk is the first branch of the right pulmonary artery and forms the common trunk for the segmental arteries A1 and A3. In the further course of the pulmonary artery between the anterior trunk and the middle lobe arteries, the segmental artery A2 is most often found as a separate branch, although numerous variants can occur here as well.
Vein V3: The veins of the right upper lobe drain into the superior pulmonary vein. The inferior vein V3 lies below the segmental bronchus B3 and arises from the confluence of the two branches V3a and V3b.