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In lobectomy, it is important to isolate and transect the supplying structures corresponding to the lobe. In the lobectomy of the left lower lobe, these are the inferior pulmonary vein, the basal part of the pulmonary artery with the origin of the artery of the 6th segment (A6), and the left lower lobe bronchus with the origin of the bronchus of the 6th segment (B6). Unlike the right side, there is no 7th segment on the left side due to the position of the heart, so the lower lobe consists of segments 6 & 8-10.
- Bronchus: The left lower lobe bronchus includes the 3 basal segmental bronchi (B8-B10) and the apical segment 6 bronchus (B6). The segmental bronchus B6 originates immediately below the upper lobe bronchus. After the origin of the segment 6 bronchus (B6), the approximately 10 to 15mm long common trunk of the 3 lower lobe segmental bronchi (B8-B10) begins.
- Artery: In the fissure, the interlobar part of the pulmonary artery can be displayed. Analogous to the bronchial system, after the origin of the A6 artery to the 6th segment, the basal part begins as the union of the 3 lower lobe segmental arteries (A8-A10). Usually, the basal part shows a bifurcation into the approximately equally strong vascular trunks of segments A8 + A9 and A10.
- Vein: The lower lobe drains its blood after the confluence of the 6th segment vein (V6) and the common basal vein (V8-V10) as the inferior pulmonary vein into the heart. This can usually be well displayed after preparation of the pulmonary ligament. Occasionally, the lingular vein may also drain into the inferior rather than the superior pulmonary vein.