Left apicoposterior segmental bronchus (B1+2)

Bronchus segmentalis apicoposterior

RespiratoryOrgansThoraxLeft side

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What it is
Segmental (tertiary) bronchus B1+2, supplying the apicoposterior 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 4 cm long and 4–6 mm in diameter; its wall holds irregular cartilage plates.
Clinical note
On the left the apical and posterior segmental bronchi share a common stem.

Nearby respiratory structures Bronchial tree (subsegmental bronchi), Left anterior segmental bronchus (B3), Left inferior lingular segmental bronchus (B5), Left lower lobe bronchus, Left lung, upper lobe (with lingula), Left main bronchus, Left superior lingular segmental bronchus (B4), Left upper lobe bronchus, Parietal pleura, Visceral pleura