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According to the course of the conduits, the right lung is divided into 10 segments. Segment 6 is the superior lower lobe segment here.
Notes: In approximately 40 percent of cases, the right lower lobe has a subdorsal subsegment between S6 and S9/10. These and other normal variants can often be identified in preoperative imaging, and the surgical approach can be adjusted accordingly.
- Bronchus B6: The B6 segmental bronchus is the first dorsal branch from the right lower lobe stem bronchus and is often somewhat dorsal and opposite the middle lobe bronchus. Below the origin of B6, there is a 10-15 mm common trunk of the 4 basal segmental bronchi (B7, B8, B9, and B10).
- Artery A6: In the interlobar region between the upper, middle, and lower lobes is the pars interlobaris of the right pulmonary artery. Slightly below the origin of the middle lobe artery, this transitions into the lower lobe artery (pars basalis) and gives off the segmental artery A6.
- Vein V6: The segmental vein V6 is more variable in its course compared to the anatomy of the segmental bronchus and segmental artery. The venous drainage of segment 6 can arise from 3 inflows of equal size, which run together with the subsegmental bronchi. A confluence of only 2 venous trunks into V6 is also possible. The segmental vein V6 then merges with the central lower lobe vein (basal vein) to form the inferior pulmonary vein.