Left superior segmental bronchus (B6)

Bronchus segmentalis superior

RespiratoryOrgansThoraxLeft side

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What it is
Segmental (tertiary) bronchus B6, supplying the superior bronchopulmonary segment of the left lower lobe.
Function
Conducts air to one bronchopulmonary segment, a pyramidal unit of lung with its own bronchus and segmental artery.
Size
About 3 cm long and 4–6 mm in diameter; its wall holds irregular cartilage plates.
Clinical note
The superior segment of the lower lobe is the commonest site of aspiration pneumonia in a patient lying on the back.

Nearby respiratory structures Left anteromedial basal segmental bronchus (B7+8), Left apicoposterior segmental bronchus (B1+2), Left inferior lingular segmental bronchus (B5), Left lateral basal segmental bronchus (B9), Left lower lobe bronchus, Left lung, lower lobe, Left posterior basal segmental bronchus (B10), Left superior lingular segmental bronchus (B4), Left upper lobe bronchus, Visceral pleura