definition of epidermis and dermis
The epidermis is the outermost layer of the skin. The thickness of the epidermis varies depending on the type of skin. For example, it's thinnest on the eyelids at just half a millimeter, and thickest on the palms of the hands and soles of the feet at 1.5 millimeters.
The dermis is the thickest layer of skin and has two parts: the papillary layer and the reticular layer. The dermis contains a lot of the body's water supply, and its key functions are to regulate temperature and supply the epidermis with blood. This layer of the skin also contains: Blood vessels.