The inferior lingular segmental bronchus of the left superior lobe bronchus ramifies to form the bronchial tree of the inferior lingular bronchopulmonary segment of the superior lobe. The lingular bronchopulmonary segments, four and five, are very rarely demarcated as a separate lobe that is equivalent to the right middle lobe.
The inferior lingular bronchopulmonary segment is supplied uniquely by the inferior lingular segmental bronchus; it forms a discrete functional unit.
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