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Left main bronchus

Other Terms: Left bronchus, Left principal bronchus, Bronchus principalis sinister, Bronche principale gauche


The bronchi are the two branches of the trachea at its bifurcation that allow air passage to the each lung. The left bronchus is about five centimeters (two inches) long, and is longer, narrower, and more vertical than the right. The two bronchi diverge at an angle of about 130 degrees. The left bronchus crosses anterior to the esophagus, the thoracic duct, and the descending aorta, under the transverse aorta, and lies behind the left pulmonary artery.


Bronchus principalis sinister


Bronche principale gauche


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