The main function of the epidermis is to form a tough barrier against the outside world, while the dermis is a soft, thick cushion of connective tissue that lies directly below the epidermis and largely determines the way our skin looks. Both layers keep repairing and renewing themselves throughout or life, but the dermis does it more slowly than the epidermis. Under the dermis is a layer of fat cells, which is known as adipose tissue (or subcutaneous fat layer). It provides insulation and protective padding for the body. It also provides an emergency energy supply.
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