Which tissue lies directly under the dermis and is largely fat, insulating the body and storing energy?

• A. Subcutaneous Tissue
• B. Dermis
• C. Epidermis
• D. Muscle

Answer: (A)

The tissue directly beneath the dermis that is largely fat and serves as insulation and energy storage is the subcutaneous tissue (also called the hypodermis). This layer is made mainly of adipose tissue, which stores energy as fat and provides insulation to help regulate body temperature, as well as padding to cushion underlying muscles and bones. It sits between the dermis and the deeper structures like muscles, which is why it’s the layer responsible for these insulating and energy-storing roles. The dermis itself is a fibrous, vascular layer that supports the epidermis and houses glands and hair follicles, while the epidermis is the outermost protective layer. Muscular tissue lies deeper still, so it isn’t the fat-rich layer under the skin.