Human skin is a complex organ with a layered structure. It's not simply one layer, but rather three primary layers working together to protect and regulate the body.
The Three Main Layers of Skin
- Epidermis (Outer Layer): This is the outermost layer, acting as a barrier against the external environment. As noted in multiple sources like Cleveland Clinic's article on the epidermis, it's the body's outermost layer.
- Dermis (Middle Layer): Situated beneath the epidermis, the dermis contains vital structures like blood vessels, nerves, hair follicles, oil glands (sebaceous glands), and sweat glands (eccrine glands, which are the "true" sweat glands as stated in SEER Training's Layers of the Skin). The Cleveland Clinic's article on the dermis details its middle layer location and function. The dermis also provides structural support and strength to the skin.
- Subcutaneous Tissue (Innermost Layer): Primarily composed of fatty tissue, this layer provides insulation, cushioning, and energy storage. Our initial reference confirms this as the innermost layer comprised of fat.
Supporting Structures and Functions
The skin's structure supports several crucial functions, including:
- Protection: A barrier against pathogens, UV radiation, and physical injury.
- Regulation: Temperature control through sweat gland activity and blood vessel constriction/dilation.
- Sensation: Nerves in the dermis allow for touch, pain, temperature, and pressure perception.
While some references discuss the complexities of skin structure and function (What is the 'true' function of skin? - PMC), the basic three-layer model (epidermis, dermis, subcutaneous tissue) provides a foundational understanding.
