![This is blank.](https://digitalhistology.org/wp-content/themes/histology-unified/imgs/trans.png)
Terminal Bronchiole
The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x
![Epithelium <p>The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.C.B.09.P01.png)
Epithelium
The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x
![- Cilia <p>The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.C.B.09.P02.png)
- Cilia
The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x
![- Basal bodies <p>The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.C.B.09.P03.png)
- Basal bodies
The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x
![- Club cells <p>The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.C.B.09.P04.png)
- Club cells
The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x
![Lamina propria <p>The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x</p>](https://digitalhistology.org/wp-content/uploads/2018/07/O.R.I.C.B.09.P05.png)
Lamina propria
The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x
![- Elastic fibers <p>The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x</p>](https://digitalhistology.org/wp-content/uploads/2018/07/O.R.I.C.B.09.P06.png)
- Elastic fibers
The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x
![- Smooth muscle <p>The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.C.B.09.P07.png)
- Smooth muscle
The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x
![Alveoli <p>The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.C.B.09.P08.png)
Alveoli
The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x
![Bronchial vessel <p>The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.C.B.09.P9.png)
Bronchial vessel
The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x
![Pulmonary vessel <p>The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.I.C.B.09.P10.png)
Pulmonary vessel
The smallest bronchiole (terminal) resembles a larger bronchiole except that it is narrower in diameter and its layers are thinner. The epithelium is simple columnar with cilia; club cells appear for the first time here. Elastic fibers continue in the lamina propria. A smooth muscle layer is still present. 200x, 1000x