In a study reported some years ago, it was found that the total cross-sectional area of the trachea and bronchial tree remained approximately the same down to the bronchioles about 1 mm. in diameter.

The trachea is a tube-like structure in the neck and upper chest. It stretches from the larynx, or voice box, to the bronchi and transports air to and from the lungs when a person breathes. When a ...

At bronchoscopy on December 10 the mucosa became irregular approximately 5 cm. in the trachea, with heaped-up, multinodular, raised areas, which were seen around the circumference of the trachea. In ...