How many layers are there in the integumentary system?

The integumentary system is comprised of two primary layers: the epidermis and the dermis. The epidermis is the outermost layer, primarily providing a protective barrier against environmental factors and containing keratinocytes, melanocytes, and other specialized cells. Beneath the epidermis is the dermis, which houses blood vessels, nerves, hair follicles, and connective tissue that support the skin.

In addition to these two layers, there is also the subcutaneous tissue, or hypodermis, which lies beneath the dermis and contains fat and connective tissue, serving as insulation and cushioning for the body. However, when referring specifically to the layers of the skin itself, the structure is defined by the epidermis and the dermis. Thus, indicating there are specifically two layers aligns with the understanding of the skin’s anatomical organization.