Medical Dermatology Services

Anatomy of the skin

Skin is the largest organ on the human body. It creates a protective layer against heat, light, the environment, injury and infection. It helps regulate the body’s temperature stores water, fat and Vitamin D, prevents entry of bacteria, and acts as a sensory organ. On average, an adult has between 18 and 20-square feet of skin, which roughly weighs six pounds.

There are three layers to skin:

Epidermis – This is the outer most layer that sloughs off dead skin cells and acts as a protective barrier against foreign bodies, infections and the sun. The epidermis also contains the cells (melanocytes), which are responsible for skin pigmentation.

Dermis – The middle layer of skin, the dermis houses hair follicles, sebaceous (oil) glands, sweat glands, capillaries (small blood vessels) and lymph vessels. It is held together by a protein called collagen. Sweat glands are part of the body’s cooling system. The dermis also contains touch and pain receptors.

Subcutaneous – This is the deepest layer of skin containing larger blood vessels and nerves. It is made up of a network of collagen and fat cells and plays an important role in the manufacture of Vitamin D, protecting against injury and conserving body heat.