What does the integumentary system include?

The integumentary system primarily comprises the skin, which serves as the body's largest organ. It plays several vital roles, including protection against environmental hazards, regulation of body temperature, and sensation. The skin consists of multiple layers that contribute to its functions, including the epidermis, dermis, and subcutaneous tissue. This system also includes structures associated with the skin, such as hair follicles, nails, and various glands, which further enhance its protective and regulatory capabilities. Understanding the integumentary system is crucial for professionals in cosmetology, as it directly impacts skin care practices and treatments.