The esophagus (also known as the food pipe, food tube, or gullet) is a hollow, muscular tube that carries food and liquid from your throat to your stomach.
The trachea, also known as the windpipe, is a tube-like structure located in the neck and upper chest.



Pseudostratified ciliated columnar epithelium
In this type of epithelium, there is only one layer of cells on the basement membrane, but due to the varying heights of these cells, their nuclei are seen at different levels, and it appears as though the epithelium is composed of multiple layers of cells. For this reason, it is called pseudostratified.
This type of covering tissue exists in the respiratory passages.

Stratified squamous epithelium
In this type of epithelium, the surface cells are squamous and flat, while the rest of the cells are polygonal.
The deepest layer is composed of tall or short columnar cells, which is also known as the basal or base layer.
Stratified squamous epithelium, if the most superficial layer consists of keratinized cells, is called keratinized stratified squamous epithelium (like skin), and if not, it is known as non-keratinized stratified squamous epithelium (like the lining of the esophagus and vagina).


Simple cuboidal epithelium
This type of epithelium is composed of cuboidal cells with round and central nuclei. The ducts of secretory glands are lined with this type of epithelium.