How many layers are there in the skin?

The skin is composed of three primary layers, each with distinct functions and characteristics. The outermost layer, known as the epidermis, serves as a protective barrier against environmental elements, pathogens, and water loss. Beneath the epidermis is the dermis, which contains connective tissue, blood vessels, hair follicles, and sweat glands, playing a vital role in supporting the epidermis and facilitating communication between the skin and the body. Finally, the innermost layer is the subcutaneous tissue, or hypodermis, which consists mainly of fat and connective tissue, providing insulation and cushioning and anchoring the skin to underlying structures.

Understanding these three layers is essential for comprehending the overall function of the skin, including protection, sensation, and thermoregulation.