Which layer of skin is primarily responsible for thermoregulation and fat storage?

The subcutaneous layer, also known as the hypodermis, is primarily responsible for thermoregulation and fat storage. This layer is located beneath the dermis and consists of loose connective tissue and fat cells. The fat stored in this layer acts as an energy reserve and helps insulate the body, maintaining warmth and regulating temperature. Additionally, the thickness of this layer can vary significantly among individuals, influencing overall body temperature regulation.

In contrast, the epidermis is the outermost layer of the skin and primarily acts as a protective barrier, while the dermis contains blood vessels, hair follicles, and sweat glands, contributing to various skin functions but not focused specifically on fat storage and thermoregulation. The stratum germinativum is a deeper layer of the epidermis involved in the generation of new skin cells, and it does not play a direct role in thermoregulation or fat storage.