Terminal bronchiole
As bronchioles continue to decrease in diameter, their pseudostratified epithelium decreases in thickness until it becomes simple columnar epithelium with cilia in the smallest, or terminal, bronchioles. Goblet cells are not present in terminal bronchioles, but another secretory cell type, the club cell, appears. 400x, 1000x
Pseudostratified epithelium
As bronchioles continue to decrease in diameter, their pseudostratified epithelium decreases in thickness until it becomes simple columnar epithelium with cilia in the smallest, or terminal, bronchioles. Goblet cells are not present in terminal bronchioles, but another secretory cell type, the club cell, appears. 400x, 1000x
Simple columnar epithelium
As bronchioles continue to decrease in diameter, their pseudostratified epithelium decreases in thickness until it becomes simple columnar epithelium with cilia in the smallest, or terminal, bronchioles. Goblet cells are not present in terminal bronchioles, but another secretory cell type, the club cell, appears. 400x, 1000x
- Cilia
As bronchioles continue to decrease in diameter, their pseudostratified epithelium decreases in thickness until it becomes simple columnar epithelium with cilia in the smallest, or terminal, bronchioles. Goblet cells are not present in terminal bronchioles, but another secretory cell type, the club cell, appears. 400x, 1000x
Lamina propria
As bronchioles continue to decrease in diameter, their pseudostratified epithelium decreases in thickness until it becomes simple columnar epithelium with cilia in the smallest, or terminal, bronchioles. Goblet cells are not present in terminal bronchioles, but another secretory cell type, the club cell, appears. 400x, 1000x
- Smooth muscle
As bronchioles continue to decrease in diameter, their pseudostratified epithelium decreases in thickness until it becomes simple columnar epithelium with cilia in the smallest, or terminal, bronchioles. Goblet cells are not present in terminal bronchioles, but another secretory cell type, the club cell, appears. 400x, 1000x
Club cells >
Club cells appear in the terminal bronchiole and continue in respiratory bronchioles. They secrete most of the airway secretions, stabilize surfactant, degrade inhaled toxins and are the progenitor cells for themselves and ciliated cells.
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