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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 B2: 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 segment bronchus containing the segment bronchi B1 + B3 and a posterior B2 segment bronchus that runs somewhat dorsolaterally apically.
Artery A2: The segmental arteries of the right upper lobe run with the 3 segment 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 frequently found as a separate branch, although numerous variants can also occur here.
Vein V2: The veins of the right upper lobe drain into the superior pulmonary vein. The posterior vein V2 is the largest vein of the upper lobe and is very variable in its course. Most commonly, the course of the segmental vein is between the segment bronchi B2 and B3.