This is a picture of skin. Skin is made up of epithelial tissue. Epithelial tissue lines the surfaces and cavities of the body's organs, as well as the entire body itself. There are many different subcategories of epithelial tissues: columnar, squamous, cuboidal, an transitional. Some areas have many layers of the cells, called stratified, and other areas only have one layer, called simple. Epithelial cells are used for protection from the sun and bacteria and to secrete hormones and enzymes. The top layer of skin is made up of squamous cells, then under that are cuboidal cells, and at the bottom, or the basement membrane, are the columnar cells.
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