- 1 = Trachea
- 2 = Right bronchus
- 3 = Left bronchus
- 4 = Right lobe: superior (4a), middle (4b), inferior (4c) lobes
- 5 = Left lobe: superior (5a) and inferior (5b) lobes
- 6 on the right = Horizontal fissure
- 6 on the left = Oblique fissure
- 7 = Oblique fissure
- 8 = Pulmonary artery
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