Right superior lobar bronchus
Bronchus lobaris superior dexter
- Latin synonym: Bronchus eparterialis
Definition
The right superior lobar bronchus (Right upper lobe bronchus, RULB) is the first major branch of the right main bronchus, arising shortly after the trachea bifurcates at the carina. It supplies ventilation to the right upper lobe of the lung.
Key anatomical features:
Origin: It branches off the right main bronchus at a relatively high level typically within approximately 25-29 mm from the carina, though this varies by measurement method and population. This short distance between the carina and the takeoff of the right superior lobar bronchus is a distinguishing feature of the right bronchial tree compared to the left.
Position: It is classified as an eparterial bronchus, meaning it arises above the right pulmonary artery a unique feature not shared by any bronchus on the left side.
Segmental branches: It typically trifurcates into three segmental bronchi supplying the right upper lobe:
The most common branching pattern is a classic trifurcation (B1-B2-B3), seen in approximately 59-64% of individuals. Other recognized variants include bifurcated patterns such as B1+2 with B3, or B2 with B3+1. ts variable anatomy including occasional origin directly from the trachea (known as a tracheal bronchus).
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