Summary:
- The skin is the major organ of the integumentary system, which also includes the nails and hair.
- The skin has 20 blood vessels, 650 sweat glands, and more than a thousand nerve endings.
- It also has an incredible 60,000 pigment-producing cells.
- All of these structures are packed into a stack of cells that is just 2 mm thick.
- Although the skin is thin, it consists of two distinct layers, called the epidermis and the dermis.
- These layers are shown in Figure below.