Epidermis Layers

The deepest layer of the epidermis is the stratum basale. Keratinocytes form in this layer and then move up through the epidermis to the most superficial layer, where they are shed as dead skin cells. The stratum basale also holds melanocytes. Melanoctytes are needed to protect the skin from UV radiation and determine skin color. The second deepest layer give the skin its strength and flexibility. This layer is called the stratum spinosum. The third most superficial layer is the stratum granulosum. Part of the production of keratin takes place in this layer. The next layer is the stratum lucidum. This layer is only found on the plams of hands, soles of feet, and finger/toe tips. The most superficial layer of the epidermis is the stratum corneum.