The trachea and bronchi are lined by a pseudostratified, ciliated, columnar epithelium, with goblet (mucous-secreting) cells and submucosal (mucous- and liquid-secreting) glands also present.

In healthy individuals, the bronchial epithelium is a columnar, pseudostratified layer, containing ciliated, goblet, and basal cells. In diseases such as asthma, the bronchial epithelium plays an ...