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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
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
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
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
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
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