The trachea is a tubular structure.
It extends from the larynx through the neck to the thorax (10 – 14 cm in length).
The trachea terminates at the carina and bifurcates into the left and right main stem bronchi.
Within the thorax the trachea lies in the mediastinum, its lower position is directly behind the heart and large vessels.
Normal anatomy of the lower airway
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