Which statement best describes the hypodermis (subcutaneous tissue)?

• A. It is the outermost layer of the skin
• B. It lies within the dermis
• C. It lies beneath the dermis and contains fat
• D. It is primarily muscle tissue

Answer: (C)

The hypodermis, or subcutaneous tissue, sits beneath the dermis and is mainly made of fat (adipose tissue) with connective tissue. This fat layer stores energy, provides insulation to help regulate temperature, and cushions underlying structures from impacts. It also contains larger blood vessels and nerves, which helps explain its role in supporting the skin and supplying it. Because of its position and composition, the statement that it lies beneath the dermis and contains fat is the best description. It is not the outermost layer (that’s the epidermis), not located within the dermis, and not primarily muscle tissue.