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The luminal surface of the trachea is lined with a pseudostratified columnar epithelium. In some areas, individual epithelial cells can be identified in this semi-thin section.
Cilia - extend 5 to 7 µm from the surface of the epithelial cells. The dark line at their base is from their basal bodies.
Goblet Cells - scattered cells that secrete mucus. They are difficult to identify in this specimen.
Basement Membrane - the epithelium is separated from the underlying connective tissue by a thick basement membrane. Difficult to identify in this specimen.
Since it lines the respiratory tract, a pseudostratified ciliated, columnar epithelium with goblet cells is referred to as the "respiratory epithelium".
