The document summarizes the integumentary system. It discusses that the skin, hair, nails, sweat glands and oil glands make up this system. The skin has three layers - the epidermis, dermis and subcutaneous layer. The epidermis contains keratin and melanin that protects from the sun. The dermis has collagen, blood vessels, nerves and structures like hair follicles and sweat/oil glands. The subcutaneous layer stores fat. Disorders like acne, boils, scabies and various fungal infections and skin cancers can affect the integumentary system.