Skin is comprised of three layers:
- Epidermis – the outermost layer
- Dermis – the middle layer
- Subcutaneous layer – the innermost layer
The cells of the epidermis cover and protect you. Specialized cells promote continual regeneration of the skin. The epidermis has no blood supply, so its health and appearance depend on nutrients that filter from the dermis and its blood vessels.
The dermis contains collagen, nerve endings, blood vessels, and oil and sweat glands. The collagen in the dermis gives structure to the skin, and provides the infrastructure for elastin and hyaluronic acid to be retained. Elastin is responsible for the skin's elasticity and hyaluronic acid retains moisture. More collagen in the dermis enables more elastin and hyaluronic acid to be present.
The subcutaneous layer is made up mostly of fat which provides fat, keeps you warm, and absorbs shocks.
Beneath the skin are muscles and bones. The facial bones support the muscle and the skin, giving shape and support to the face. Facial muscles attach directly to the skin, unlike in other areas of the body. This results in more movement of the skin as you move the muscles of your face.