Figure 1.9.1-C. Schematic of the anatomy of the normal bronchial tree with 
a cut-away view of the epithelium and submucosal bronchial glands. Further, 
details for the epithelium of the bronchi, submucosal glands, and 
bronchioles are described in Figures 1.9.1-D, 1.9.2-A, 1.9.2-B. After 
generation 20 the respiratory bronchioles open into the alveoli, the air 
exchanging region of the lung. For illustration purposes, a number of 
branches between the large airways and bronchioles are not shown. 
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