Right lateral segmental bronchus (B4)

Bronchus segmentalis lateral

RespiratoryOrgansThoraxRight side

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What it is
Segmental (tertiary) bronchus B4, supplying the lateral bronchopulmonary segment of the right middle 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
Because each segment has its own airway and blood supply, a diseased segment can be removed on its own (segmentectomy).

Nearby respiratory structures Bronchus intermedius, Right anterior basal segmental bronchus (B8), Right anterior segmental bronchus (B3), Right lateral basal segmental bronchus (B9), Right lower lobe bronchus, Right lung, lower lobe, Right lung, middle lobe, Right medial basal segmental bronchus (B7), Right medial segmental bronchus (B5), Right middle lobe bronchus