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pl. bronchi [L. bronchus, fr. Gr. bronchos, windpipe]
One of the two terminal branches of the trachea. The trachea divides opposite the third thoracic vertebra into the right and left main or primary bronchi. The point of division is easily seen on a radiograph by the carina (a vertically oriented cartilaginous structure). The right bronchus is shorter, wider, and more vertical than the left one. After entering the lung, each bronchus divides into secondary bronchi that serve each lobe of the lung.
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