Right main bronchus is a short, wide air passageway into your right lung. Left main bronchus is a narrow, long passageway into your left lung. Your right and left main bronchi are the widest portions of your bronchi. Then your bronchi divide into branches that …

bronchus, any of the large airway passages of the lower respiratory tract that diverge from the trachea (windpipe) and connect to the lungs.The trachea divides in an inverted Y into the two stem (or main) bronchi, one each for the left and right lung.The right main bronchus has a larger diameter, is oriented more vertically, and is shorter than the left main bronchus.