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The integumentary system also known as the dermal system

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is the largest system in the human body.

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It consists of structures that form the

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body's outer covering. And its functions include

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protection against the external environment;

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regulation of body temperature;

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regulation of hydration levels;

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sensory perception of touch, temperature, and pain; and synthesis of vitamin D.

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The major components of the integumentary system

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are the skin and the subcutaneous tissue.

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The skin consists of two layers:

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the epidermis, which is a superficial cellular layer of the skin, and

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the dermis, which is a deep connective tissue layer of the skin.

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The subcutaneous tissue also known as a

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superficial fascia or hypodermis is the connective tissue

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layer located immediately deep to the dermis consisting of adipose tissue or fat.