Skin Structure

The skin is the largest human organ. It covers between 1.5 and 2 m2 , comprising about one sixth of total body weight.

The skin consists of three functional layers:

• Epidermis
• Dermis or corium
• Subcutis (hypodermis)

In these layers are found the epidermal appendages: nails, hair and glands. The skin performs various functions such as temperature regulation and insulation, energy storage, sensory perception and protection from environmental influences such as fungi, bacteria and (UV) radiation.

Sebaceous and sweat glands belong to the exocrine glands. Sebaceous glands are nearly always connected to hair follicles. Sweat glands deliver their secretions directly to the skin surface.
 

1. Epidermis 2. Dermis 3. Subcutis 4. Hair follicle 5. Sebaceous gland 6. Sweat gland