What is the primary function of the subcutaneous layer?

The primary function of the subcutaneous layer, also known as the hypodermis, is to connect the skin to underlying tissues while also serving as a site for fat storage. This layer is crucial because it provides insulation, helping to regulate body temperature by retaining heat and preventing excessive heat loss. Additionally, the fat stored in this layer serves as an energy reserve and cushions underlying structures, such as muscles and bones, from external trauma.

While the subcutaneous layer may have secondary roles in temperature regulation, it is not primarily involved in the production of sweat or acting as a protective barrier for the epidermis, which are roles more closely associated with other layers of the skin and associated glands.