What does the dermis primarily contain?

The dermis primarily contains vessels and nerves, which are crucial for its functions. It is the layer of skin located beneath the epidermis and is made up of connective tissue that provides strength, elasticity, and support to the skin. The presence of blood vessels in the dermis is important for thermoregulation and nutrient supply to the skin and other tissues. Nerves in the dermis are responsible for sensation, including touch, pain, and temperature perception, making this layer vital for the body's interaction with the environment.

The other options do not accurately represent the primary contents of the dermis. Although the epidermis is the outermost layer of skin and contains epidermal cells, it is not part of the dermal structure. Fat and muscle tissue are associated more with subcutaneous tissue beneath the dermis. Similarly, bone and cartilage are components of the skeletal system and are not present in the dermis.