Diagram of the Trachea, Lobar, and Segmental Bronchi Showing Median Lengths and Diameters for a 170 Cm Height Patient

(From Campos J. Lung isolation in patients with difficult airways. In: Slinger P, ed. Principles and Practice of Anesthesia for Thoracic Surgery. New York, NY: Springer; 2011:247-258, with permission.)

The lengths and diameters of the bronchi vary considerably between individuals.