The dermis is the layer of skin that lies underneath the epidermis, and its primary roles are to regulate temperature and to give blood to the skin. The dermis is responsible for the thickness of the skin and accounts for about 90 percent of the total thickness of the skin.
The dermis is made up of a great number of different cells and structures. In addition to hair follicles and sweat glands, the dermis has blood arteries and lymph vessels within its confines. The sebaceous glands that produce oil and help the skin maintain its smooth texture are found in the dermis layer of the skin. In addition, the dermis contains both collagen and elastin, as well as nerve endings. The papillary layer of the dermis is composed of tiny collagen fibres, while the reticular layer of the dermis is composed of thick collagen fibres. The dermis is divided into two sublayers.