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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 B1: The right upper lobe bronchus arises apicolaterally at an angle of 90° from the right main bronchus and also gives off the segmental bronchus B1 apicolaterally. In more than half of the cases, the upper lobe bronchus divides into an apical segmental bronchus containing the segmental bronchi B1 + B3 and a posterior B2 segmental bronchus, which runs somewhat dorsolaterally apically.
Artery A1: The segmental arteries of the right upper lobe run with the 3 segmental bronchi and show great variability in position 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.
Vein V1: The veins of the right upper lobe drain into the superior pulmonary vein. The anterior apical vein V1 runs superficially beneath the mediastinal visceral pleura.