Results: With 22 pairs of lungs (17 male, 5 female), we obtained the following results: mean diameters of the right and left main bronchus are 14.19 ± 2.14 mm and 12.45 ± 1.69 mm; mean lengths of the right and left main bronchus are 20.41 ± 7.03 mm and 48.08 ± 4.47 mm.