Which structure is the fat layer beneath the skin?

• A. Dermis
• B. Subcutaneous Layer
• C. Epidermis
• D. Cartilage

Answer: (B)

Under the skin lies the subcutaneous layer, also called the hypodermis. It is primarily adipose tissue, the fat storage tissue, which provides insulation, energy reserve, and cushioning against impacts. This layer sits directly beneath the dermis and above deeper structures like muscles, helping to regulate temperature and protect the body. The epidermis is the outer protective layer, the dermis is the thicker middle layer with connective tissue, blood vessels, nerves, and glands, and cartilage is a separate connective tissue found in joints and the ear, not part of the skin’s fat layer.