Squamous epithelium lines the terminal bronchioles, air sacs and alveoli of lungs, etc. Cuboidal epithelium lines small salivary and pancreatic ducts and some portions of the ducts of sweat glands, while compound epithelium is present in the lining of oral cavity, tongue, pharynx and oesophagus. These types of epithelial cells are present on those surfaces which may subject to abrasion but are completely protected from drying