Left superior lingular segmental bronchus (B4)

Bronchus segmentalis superior lingular

RespiratoryOrgansThoraxLeft side

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What it is
Segmental (tertiary) bronchus B4, supplying the superior lingular bronchopulmonary segment of the left upper lobe.
Function
Conducts air to one bronchopulmonary segment, a pyramidal unit of lung with its own bronchus and segmental artery.
Size
About 2 cm long and 4–6 mm in diameter; its wall holds irregular cartilage plates.
Clinical note
The lingular segments correspond to the right middle lobe.

Nearby respiratory structures Bronchial tree (subsegmental bronchi), Left anterior segmental bronchus (B3), Left apicoposterior segmental bronchus (B1+2), Left inferior lingular segmental bronchus (B5), Left lower lobe bronchus, Left lung, upper lobe (with lingula), Left main bronchus, Left upper lobe bronchus, Parietal pleura, Visceral pleura