## Bronchopulmonary Segments of the Right Lung **Key Point:** The right lung has 10 bronchopulmonary segments organized into three lobes: superior (3 segments), middle (2 segments), and inferior (5 segments). ### Superior Lobe Segments (Right Lung) The superior lobe contains three segments arranged in an anteroposterior sequence: | Segment | Number | Position | Bronchial Supply | | --- | --- | --- | --- | | Apical | S1 | Apex, superior to horizontal fissure | Apical segmental bronchus | | Posterior | S2 | Posteriorly, superior to horizontal fissure | Posterior segmental bronchus | | Anterior | S3 | Anteriorly, superior to horizontal fissure | Anterior segmental bronchus | **High-Yield:** The apical segment (S1) is the most superior segment of the right lung, located at the apex. It is supplied by the **apical segmental bronchus**, which arises from the right superior lobar bronchus. ### Clinical Pearl Tuberculosis has a predilection for the apical and posterior segments (S1 and S2) of the superior lobes due to higher oxygen tension in these regions. This is why apical consolidation is a classic radiological finding in pulmonary TB. **Mnemonic for Right Superior Lobe Segments:** **APA** = Apical, Posterior, Anterior (superior to inferior in the anteroposterior plane). ### Anatomical Relationships All three superior lobe segments lie **above the horizontal (minor) fissure**, which separates the superior and middle lobes. The apical segment is the most cranial of these three. 
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