Posterior basal segmental bronchus of left lung
Bronchus segmentalis basalis posterior pulmonis sinistri
- Latin synonym: Bronchus X pulmonis sinistri
- Synonym: Bronchus 10 of left lung; B10
- Related terms: Posterior basal segmental bronchus [B X]
Definition
The posterior basal segmental bronchus of the left lung (B10) is the segmental bronchus that arises from the left basal trunk (the common basal bronchus of the left lower lobe) and supplies the posterior basal segment (S10) of the left lower lobe. It is the most posteriorly and inferiorly directed of the basal segmental bronchi.
Anatomical details:
Origin: B10 branches from the left lower lobe basal bronchus, typically as part of a bifurcation or trifurcation pattern. In the left lung, the basal bronchi most commonly divide in a bifurcation pattern (~75% of cases) or trifurcation pattern (~18%), with B10 arising as one of the terminal branches.
Course and territory: B10 courses posteriorly and inferiorly to ventilate the posterior basal segment (S10), which occupies the most posterior and inferior portion of the left lower lobe, resting against the posterior chest wall and diaphragm.
Subsegmental branches: B10 typically gives rise to subsegmental bronchi designated B10a (posterior), B10b (lateral), and B10c (medial).
Relationship to adjacent structures: The posterior basal segment is bordered superiorly by the superior segment (S6), laterally by the lateral basal segment (S9), and medially by the medial basal segment (S7). The corresponding segmental artery (A10) and vein run in close proximity, with the artery generally lying peripheral to the bronchus and the vein lying more centrally.
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