Superior segmental bronchus of left lung
Bronchus segmentalis superior pulmonis sinistri
- Latin synonym: Bronchus VI pulmonis sinistri
- Synonym: Bronchus 6 of left lung; B6
- Eponym: Nelson's bronchus
- Related terms: Superior segmental bronchus [B VI]
Definition
The superior segmental bronchus of the left lung (B6) is the bronchus that arises from the left lower lobe bronchus and ventilates the superior segment (S6) of the left lower lobe. It is the first branch of the left lower lobe bronchus, originating from its posterosuperior aspect, just distal to the takeoff of the left upper lobe bronchus. This bronchus directs airflow to the apical (superior) portion of the lower lobe, which lies posteriorly and superiorly against the oblique (major) fissure.
Key anatomical features:
Origin: Branches from the posterior wall of the left lower lobe bronchus as the first segmental branch before the basal segmental bronchi (B7B10) arise.
Territory: Supplies the superior segment (S6) of the left lower lobe, a pyramidalshaped segment located posteriorly, abutting the oblique fissure superiorly and the vertebral column medially.
Relationship to other structures: The superior segmental bronchus is accompanied by the superior segmental artery (A6) and drained by the superior segmental vein (V6). It lies posterior to the left pulmonary artery at the hilum. [3]
In approximately 24% of individuals, an additional subsuperior segmental bronchus (B*) is present between the superior segment and the basal segments, representing a recognized anatomical variant that is important to identify prior to segmentectomy.
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