Pseudostratified epithelium is a type of epithelium that appears to be stratified but instead consists of a single layer of irregularly shaped and differently sized columnar cells. The nuclei of neighboring cells appear at different levels rather than clustered in the basal end. They function to excrete mucous to serve as a lubricant. Ciliated pseudostratified columnar epithelium cells are found in places such as the trachea and upper respiratory tract, where their cilia and mucous secretions help collect foreign materials so you can cough or sneeze them out.

This image offers a fascinating look at the transition between the esophagus and stomach, highlighting the complex epithelial structures involved. It's interesting to observe the clear boundary where the protective lining of the esophagus meets the secretory lining of the stomach. If verified, the presence of pseudostratified epithelium adds an interesting layer because it's uncommon in this region and could indicate a specialized or transitional zone. The flexibility and specialization of the epithelial tissues in the various digestive tract sections are clearly shown in this image.