Table 1.
Nomenclature for lung structure
| Right lung (primary branch) | Left lung (primary branch) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Lobe | Segment | Subsegment | Lobe | Segment | Subsegment | ||||
| 2nd branch | 3rd branch | 4th branch | 2nd branch | 3rd branch | 4th branch | ||||
| Upper | Apical | S1 | Apical | S1a | Upper | Apical-posterior | S1 + 2 | Apical | S1 + 2a |
| Anterior | S1b | Posterior | S1 + 2b | ||||||
| Posterior | S2 | Posterior | S2a | Horizontal | S1 + 2c | ||||
| Horizontal | S2b | Anterior | S3 | Lateral | S3a | ||||
| Anterior | S3 | Lateral | S3a | Medial | S3b | ||||
| Medial | S3b | Superior | S3c | ||||||
| Middle | Lateral | S4 | – | – | Lingula | Superior | S4 | – | – |
| Medial | S5 | – | – | Inferior | S5 | – | – | ||
| Lower | S6 ~ S10 | – | – | Lower | S6 ~ S10 | – | – | ||