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The trachea bifurcates into a RIGHT PRINCIPAL BRONCHUS and a LEFT PRINCIPAL BRONCHUS which pass to the right and left lungs, respectively.
The left principal bronchus divided further into LOBAR BRONCHI (bronchi is plural of bronchus) that supply each individual left lung lobe.
The right principal bronchus is also divided into LOBAR BRONCHI (bronchi is plural of bronchus) that supply each individual right lung lobe.
Examine the image series and understand the above concepts.