Non-keratinized stratified squamous epithelium is a type of tissue that lines the surfaces of organs and structures in the body. It is characterized by multiple layers of cells that are flat and irregularly shaped. This type of epithelium does not contain keratin, which is a tough, fibrous protein found in the skin, hair, and nails. Non-keratinized stratified squamous epithelium is found in several locations in the body, including the esophagus.

The esophagus is a muscular tube that connects the throat to the stomach. It plays a crucial role in the process of swallowing and transporting food from the mouth to the stomach. The inner lining of the esophagus is composed of non-keratinized stratified squamous epithelium. This type of epithelium is well suited for its function in the esophagus for several reasons.

1. Protection: The esophagus is exposed to friction and mechanical stress as food passes through it. The multiple layers of cells in non-keratinized stratified squamous epithelium provide a protective barrier against damage, preventing the underlying tissues from being disrupted.

2. Flexibility: The cells in non-keratinized stratified squamous epithelium are not rigid and are able to stretch and accommodate the movement of food as it passes through the esophagus. This flexibility allows for efficient swallowing and transport of food.

3. Secretion: Non-keratinized stratified squamous epithelium contains specialized cells that secrete mucus. The mucus helps to lubricate the esophagus, reducing friction and facilitating the movement of food.

4. Absorption: While the primary function of the esophagus is not absorption, some substances, such as alcohol and certain medications, can be absorbed through the lining of the esophagus. The thinness and permeability of non-keratinized stratified squamous epithelium allow for limited absorption to occur.

Overall, the presence of non-keratinized stratified squamous epithelium in the esophagus is essential for its function in swallowing and transporting food. It provides protection, flexibility, secretion, and limited absorption capabilities, ensuring the efficient and safe passage of food from the mouth to the stomach.

Lining of buccal cavity and oesophagus contain non keratinised, where as the rest of the alimentary canal is lined by cuboidal epithelium.