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According to the course of the conduits, the right lung is divided into 10 segments. The right lower lobe consists of 5 bronchopulmonary segments:
- The apical segment S6
- The mediobasal segment S7
- The anterobasal segment S8
- The laterobasal segment S9
- The posterobasal segment S10
Bronchus B9 and B10: The right lower lobe bronchus consists of the bronchus of the apical segment S6 and the common trunk of the 4 basal lower lobe segments. The first branching is the B6 bronchus. Approximately 1.5 cm below the B6 branching, the common trunk of the 4 basal segmental bronchi is found, which then continue in different directions. The two segmental bronchi B9 and B10 have a common trunk in a posterolateral direction. The B10 bronchus continues along the course of the lower lobe bronchus, while the B9 bronchus runs in a posterolateral direction.
Arteries A9 and A10: At the base of the fissure between the upper and middle lobes runs the pars interlobaris of the right pulmonary artery. The lower lobe artery is a continuation of the pars interlobaris. In most cases, after the branching of a branch to the 6th segment A6, the first anterior branch of the basal artery is the segmental artery A7 and the second branch is the segmental artery A8. The remaining basal artery then divides into a laterobasal branch A9 and a posterobasal branch A10.
Vein V9 and V10: The segmental vein V9 can run in front of or behind the basal part of the right bronchus and drains into the lower pulmonary vein. The segmental vein V10 is the terminal branch and begins between the segmental bronchi B9 and B10. It usually drains below the segmental bronchus B10 into the lower pulmonary vein.