TERMINAL DIVISIONS OF BRONCHI AND ULTIMATE AIR-SPACES. 313 



D. TERMINAL DIVISIONS OF BRONCHI AND ULTIMATE 



AIR-SPACES. 



The bronchioles are continued as the respiratory bronchioles. 



Lung tissue. 



Bronchiole. 



Fig. 248. 



Respiratory _ 

 bronchiole. 



Alveolar duct. 



-Lung tissue. 



Fig. 249. 



Figs. 248 and 249. Two sections of cat's lung : Fig. 248, X 5 2 > Fig. 249, X 35- 



The epithelium of the latter is ciliated in patches, but soon becomes 

 nonciliated and assumes the character of respiratory epithelium. 



