epithelial cell stratified epithelial cell Stratified epithelial cells form layers of cells stacked on top of one another, and they primarily function as a protective barrier. Their appearance can be cuboidal, columnar or squamous, and they offer a layer of defense against foreign bodies, harmful substances, pathogens, and prevent water loss and electrolyte imbalance within the body. Depending on the organ and its specific function, the topmost layer of these cells may be specialized as keratinized or non-keratinized. The skin, being constantly exposed to external physical stress, is composed of keratinized stratified epithelial cells that prevent desiccation and provide additional protection. In contrast, non-keratinized stratified epithelial cells line internally exposed surfaces like the oral cavity, esophagus, and vagina, where lubrication is required. In addition to protection, stratified epithelial cells also contribute to tissue repair processes, referred to as epithelialization. Basal epithelial cells are capable of rapid division and migration to heal wounds and maintain the protective barrier function of the tissues they line. Despite having a limited lifespan, these cells ensure a constant replacement process, maintaining their population and the integrity of epithelial layers. (This extended description was generated by ChatGPT and reviewed by the CellGuide team, who added references, and by the CL editors, who approved it for inclusion in CL. It may contain information that applies only to some subtypes and species, and so should not be considered definitional.) ZFA:0009042 An epithelial cell, organized into multiple layers, with only the basal layer being in contact with the basement membrane. https://cellxgene.cziscience.com/cellguide/CL_0000079