=== Microscopic Study: Cell Types ===

==== Slide 2: Trachea ====

On slide 2, Trachea (H &E) identify the cilia on the tall cells of the pseudostratified columnar epithelium that line the lumen of the trachea. Each cilium is derived from a basal body, represented here in aggregate by the dark lines where the cilia attach to the cell. In some regions of this tissue the cilia are absent or the entire epithelium is missing. This is artifact.