A stratified squamous epithelium consists of squamous (flattened) epithelial cells arranged in layers upon a basement membrane. Only one layer is in contact with the basement membrane; the other layers adhere to one another to maintain structural integrity. Although this epithelium is referred to as squamous, many cells within the layers may not be flattened; this is due to the convention of naming epithelia according to the cell type at the surface. In the deeper layers, the cells may be columnar or cuboidal. (wikipedia)
NYU Virtual microscopy. Upper esophagus (link)
Stratified squamous epithelium is further classified by the presence or absence of keratin, a tough protective protein, at the apical surface.
Non-keratinised surfaces must be kept moist by bodily secretions to prevent them drying out and dying.
Types of non-keratinised stratified squamous epithelium include cornea (see also corneal epithelium), oral cavity, esophagus, anal canal, vagina, and the internal portion of the lips. (from wikipedia)Other similar posts