![This is blank.](https://digitalhistology.org/wp-content/themes/histology-unified/imgs/trans.png)
Trachea and primary bronchus
Another image of the trachea or primary bronchus demonstrates the components forming the wall of these passageways. 100x
![Epithelium <p>Another image of the trachea or primary bronchus demonstrates the components forming the wall of these passageways. 100x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.E.T.05.P02.png)
Epithelium
Another image of the trachea or primary bronchus demonstrates the components forming the wall of these passageways. 100x
![- Basement membrane <p>Another image of the trachea or primary bronchus demonstrates the components forming the wall of these passageways. 100x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.E.T.05.P03.png)
- Basement membrane
Another image of the trachea or primary bronchus demonstrates the components forming the wall of these passageways. 100x
![Lamina propria <p>Another image of the trachea or primary bronchus demonstrates the components forming the wall of these passageways. 100x</p>](https://digitalhistology.org/wp-content/uploads/2018/07/O.R.E.T.05.P010LP.png)
Lamina propria
Another image of the trachea or primary bronchus demonstrates the components forming the wall of these passageways. 100x
![- Elastic lamina <p>Another image of the trachea or primary bronchus demonstrates the components forming the wall of these passageways. 100x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.E.T.05.P05.png)
- Elastic lamina
Another image of the trachea or primary bronchus demonstrates the components forming the wall of these passageways. 100x
![- Smooth muscle <p>Another image of the trachea or primary bronchus demonstrates the components forming the wall of these passageways. 100x</p>](https://digitalhistology.org/wp-content/uploads/2018/07/O.R.E.T.05.P010SM.png)
- Smooth muscle
Another image of the trachea or primary bronchus demonstrates the components forming the wall of these passageways. 100x
![- Mixed glands <p>Another image of the trachea or primary bronchus demonstrates the components forming the wall of these passageways. 100x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.E.T.05.P07.png)
- Mixed glands
Another image of the trachea or primary bronchus demonstrates the components forming the wall of these passageways. 100x
![Perichondrium <p>Another image of the trachea or primary bronchus demonstrates the components forming the wall of these passageways. 100x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.E.T.05.P08.png)
Perichondrium
Another image of the trachea or primary bronchus demonstrates the components forming the wall of these passageways. 100x
![Hyaline cartilage <p>Another image of the trachea or primary bronchus demonstrates the components forming the wall of these passageways. 100x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.E.T.05.P09.png)
Hyaline cartilage
Another image of the trachea or primary bronchus demonstrates the components forming the wall of these passageways. 100x