The skin's dermis is made of layers of cells, connective tissue and several structures that aid in maintaining its function. These structures include blood vessels, hair follicles, lymph vessels and glands.
Glands in the dermis secrete sweat and sebum. Sweat aids in maintaining body temperature. Sebum is an oily substance that maintains skin moisture. Both sweat and sebum travel to the skin surface through small openings known as pores. The dermis is one of two layers of skin. It is located directly below the epidermis, which is the layer that comes in direct contact with the external environment. Several types of cells exist in the dermis, including fibroblasts, which are responsible for secreting the connective tissue.