Lateral basal segmental bronchus of right lung
Bronchus segmentalis basalis lateralis pulmonis dextri
- Latin synonym: Bronchus IX pulmonis dextri
- Synonym: Bronchus 9 of right lung; B9
- Related terms: Lateral basal segmental bronchus [B IX]
Definition
The lateral basal segmental bronchus of the right lung (B9) is one of the four basal segmental bronchi arising from the basal trunk (basal segmental bronchus) of the right lower lobe bronchus. It supplies the lateral basal segment (S9) of the right lower lobe.
Anatomical details:
The right lower lobe bronchus first gives off the superior segmental bronchus (B6), then continues as the basal trunk, which divides into the four basal segmental bronchi: medial basal (B7), anterior basal (B8), lateral basal (B9), and posterior basal (B10).
In the most common branching pattern (identified in ~57% of cases in one CTbased study), all four basal segmental bronchi (B7, B8, B9, B10) arise as distinct branches. However, B9 frequently shares a common trunk with B8 or B10 for example, a combined B8+9 pattern was found in approximately 10% of cases.
The lateral basal segment (S9) occupies the lateral and inferior portion of the right lower lobe, bordered by the anterior basal segment (S8) anteriorly and the posterior basal segment (S10) posteriorly.
The lateral basal segmental artery (A9) typically accompanies B9, running toward the lung periphery relative to the bronchus, while the corresponding segmental vein (V9) runs more centrally (medially) relative to the bronchus.
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