Apical segmental bronchus of right lung
Bronchus segmentalis apicalis pulmonis dextri
- Latin synonym: Bronchus I pulmonis dextri
- Synonym: Bronchus 1 of right lung; B1
- Related terms: Apical segmental bronchus[B I]
Definition
The apical segmental bronchus of the right lung (B1) is the bronchus that supplies the apical segment (S1) of the right upper lobe. It is one of three segmental bronchi arising from the right upper lobe bronchus, along with the posterior segmental bronchus (B2) and the anterior segmental bronchus (B3).
Anatomical details:
The right upper lobe bronchus originates from the right main bronchus and typically trifurcates into three segmental bronchi: B1 (apical), B2 (posterior), and B3 (anterior). This classic trifurcation pattern is the most common, observed in approximately 64% of individuals.In some individuals, B1 may share a common trunk with B2 (designated B1+2), or B1 may arise separately while B2 and B3 share a common trunk (B2+3). These variant patterns were observed in roughly 22-36% of cases in CT-based anatomical studies.
The apical segmental bronchus (B1) courses superiorly to aerate the apex of the right lung, the most superior portion of the right upper lobe.
Each segmental bronchus is accompanied by a corresponding segmental pulmonary artery (A1 for the apical segment) and is bordered by intersegmental pulmonary veins that demarcate the boundaries between adjacent segments.
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