bronchopulmonary segments one and two (left lung)

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The apicoposterior bronchopulmonary segment of the left lung is actually the regions of both the apical and posterior bronchopulmonary segments before they diverge. Sometimes, it is considered as a separate segment as it is supplied by a distinct tertiary bronchus: the apicoposterior segmental bronchus.

This segmental bronchus does not exist in the right superior lobe; on the right, the apical and posterior segmental bronchi arise directly as tertiary bronchi from the right superior lobar bronchus.

Last reviewed 01/2018