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.

Twelve healthy approximately 3-yr-old captive-born 4.5-9 kg American alligators (Alligator mississipiensis) each had bronchoscopy and tracheal washes performed four times during a 10-mo period to ...