As you can see in the skin diagram, many structures are embedded in the dermis including:
lymphatic capillaries and vessels
sweat glands and their ducts
sensory nerve endings
the arrectores pilorum (or arrector pilli), involuntary muscles are sometimes activated in cold weather to give "goose bumps"
hair follicles, hair bulbs and hair roots.
Hypodermis or subcutaneous layer
This is the deepest of the layers of skin, and is located on the bottom of the skin diagram. It connects or binds the dermis above it to the underlying organs. This layer is mainly composed of loose fibrous connective tissue and fat (adipose) cells interlaced with blood vessels. In females, the hypodermis is generally about 8% thicker than in males. The main functions of the hypodermis include insulation, storing of lipids, cushioning of the body and temperature regulation.
Protects the body against physical injury.
Provides some protection for the body against numerous pathogenic microbes and chemical agents.
Helps to restrict fluid and water loss.
Helps to prevent excessive water absorption by imparting water resistance to the skin.
Is involved in temperature regulation of the body.
Is the body’s main sensory organ for temperature, pressure, touch and pain.
Provides protection from UV light.
Plays a key role in metabolism, including vitamin D synthesis and biotransformation of some chemicals. Lack of vitamin D can lead to soft bones and many associated problems.
Many people do not realize how much the skin does. As can be seen in the diagram of skin, your skin is a complex and important organ. It is also the largest organ in the body.