Right middle lobe bronchus
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The bronchus intermedius divides into the right middle lobe bronchus and the right lower lobe bronchus.
It bifurcates into two bronchopulmonary segments 1:
The right middle lobe bronchus is supplied from the right bronchial artery. This is a branch from the third right posterior intercostal artery. The bronchial veins drain into the azygos venous system 2.