![This is blank.](https://digitalhistology.org/wp-content/themes/histology-unified/imgs/trans.png)
Trachea and primary bronchus
The elastic lamina of the trachea and primary bronchi is composed of longitudinally oriented elastic fibers that are organized into a discrete band, the elastic lamina. Cells of the immune system, such as the plasma cells seen here, are prevalent in the connective tissue of the respiratory system. 1000x
![Respiratory epithelium <p>The elastic lamina of the trachea and primary bronchi is composed of longitudinally oriented elastic fibers that are organized into a discrete band, the elastic lamina. Cells of the immune system, such as the plasma cells seen here, are prevalent in the connective tissue of the respiratory system. 1000x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.E.T.09.P01.png)
Respiratory epithelium
The elastic lamina of the trachea and primary bronchi is composed of longitudinally oriented elastic fibers that are organized into a discrete band, the elastic lamina. Cells of the immune system, such as the plasma cells seen here, are prevalent in the connective tissue of the respiratory system. 1000x
![Lamina propria <p>The elastic lamina of the trachea and primary bronchi is composed of longitudinally oriented elastic fibers that are organized into a discrete band, the elastic lamina. Cells of the immune system, such as the plasma cells seen here, are prevalent in the connective tissue of the respiratory system. 1000x</p>](https://digitalhistology.org/wp-content/uploads/2018/07/O.R.E.T.09.P02-1.png)
Lamina propria
The elastic lamina of the trachea and primary bronchi is composed of longitudinally oriented elastic fibers that are organized into a discrete band, the elastic lamina. Cells of the immune system, such as the plasma cells seen here, are prevalent in the connective tissue of the respiratory system. 1000x
![- Elastic lamina <p>The elastic lamina of the trachea and primary bronchi is composed of longitudinally oriented elastic fibers that are organized into a discrete band, the elastic lamina. Cells of the immune system, such as the plasma cells seen here, are prevalent in the connective tissue of the respiratory system. 1000x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.E.T.09.P03.png)
- Elastic lamina
The elastic lamina of the trachea and primary bronchi is composed of longitudinally oriented elastic fibers that are organized into a discrete band, the elastic lamina. Cells of the immune system, such as the plasma cells seen here, are prevalent in the connective tissue of the respiratory system. 1000x
![- Elastic fibers <p>The elastic lamina of the trachea and primary bronchi is composed of longitudinally oriented elastic fibers that are organized into a discrete band, the elastic lamina. Cells of the immune system, such as the plasma cells seen here, are prevalent in the connective tissue of the respiratory system. 1000x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.E.T.09.P04.png)
- Elastic fibers
The elastic lamina of the trachea and primary bronchi is composed of longitudinally oriented elastic fibers that are organized into a discrete band, the elastic lamina. Cells of the immune system, such as the plasma cells seen here, are prevalent in the connective tissue of the respiratory system. 1000x
![- Plasma cells <p>The elastic lamina of the trachea and primary bronchi is composed of longitudinally oriented elastic fibers that are organized into a discrete band, the elastic lamina. Cells of the immune system, such as the plasma cells seen here, are prevalent in the connective tissue of the respiratory system. 1000x</p>](https://digitalhistology.org/wp-content/uploads/2018/06/O.R.E.T.09.P05.png)
- Plasma cells
The elastic lamina of the trachea and primary bronchi is composed of longitudinally oriented elastic fibers that are organized into a discrete band, the elastic lamina. Cells of the immune system, such as the plasma cells seen here, are prevalent in the connective tissue of the respiratory system. 1000x