
Transition of terminal to respiratory bronchiole
This transition shows the simple columnar ciliated epithelium of the terminal bronchiole continuing into simple cuboidal epithelium with scattered cilia of the respiratory bronchiole. Club cells are present in both passages, as are longitudinally arranged elastic fibers in lamina propria and a thin muscle layer. 400x

Terminal bronchiole
This transition shows the simple columnar ciliated epithelium of the terminal bronchiole continuing into simple cuboidal epithelium with scattered cilia of the respiratory bronchiole. Club cells are present in both passages, as are longitudinally arranged elastic fibers in lamina propria and a thin muscle layer. 400x

Respiratory bronchiole
This transition shows the simple columnar ciliated epithelium of the terminal bronchiole continuing into simple cuboidal epithelium with scattered cilia of the respiratory bronchiole. Club cells are present in both passages, as are longitudinally arranged elastic fibers in lamina propria and a thin muscle layer. 400x

Simple columnar epithelium
This transition shows the simple columnar ciliated epithelium of the terminal bronchiole continuing into simple cuboidal epithelium with scattered cilia of the respiratory bronchiole. Club cells are present in both passages, as are longitudinally arranged elastic fibers in lamina propria and a thin muscle layer. 400x

Simple cuboidal epithelium
This transition shows the simple columnar ciliated epithelium of the terminal bronchiole continuing into simple cuboidal epithelium with scattered cilia of the respiratory bronchiole. Club cells are present in both passages, as are longitudinally arranged elastic fibers in lamina propria and a thin muscle layer. 400x

Cilia
This transition shows the simple columnar ciliated epithelium of the terminal bronchiole continuing into simple cuboidal epithelium with scattered cilia of the respiratory bronchiole. Club cells are present in both passages, as are longitudinally arranged elastic fibers in lamina propria and a thin muscle layer. 400x

Club cells
This transition shows the simple columnar ciliated epithelium of the terminal bronchiole continuing into simple cuboidal epithelium with scattered cilia of the respiratory bronchiole. Club cells are present in both passages, as are longitudinally arranged elastic fibers in lamina propria and a thin muscle layer. 400x

Elastic fibers
This transition shows the simple columnar ciliated epithelium of the terminal bronchiole continuing into simple cuboidal epithelium with scattered cilia of the respiratory bronchiole. Club cells are present in both passages, as are longitudinally arranged elastic fibers in lamina propria and a thin muscle layer. 400x

Smooth muscle
This transition shows the simple columnar ciliated epithelium of the terminal bronchiole continuing into simple cuboidal epithelium with scattered cilia of the respiratory bronchiole. Club cells are present in both passages, as are longitudinally arranged elastic fibers in lamina propria and a thin muscle layer. 400x