Which statement about the subcutaneous layer is true?

• A. It is the outermost protective layer
• B. It primarily contains adipose tissue that stores energy and provides insulation
• C. It is the central site of melanin production
• D. It is the same as the dermis

Answer: (B)

The subcutaneous layer, or hypodermis, lies beneath the dermis and is mainly composed of adipose tissue. This tissue stores energy as fat, provides insulation to help regulate body temperature, and cushions the body against mechanical shocks. It also helps anchor the skin to underlying tissues and houses larger blood vessels and nerves. The outer protective layer is the epidermis, where melanin production occurs in pigment-producing cells, not in the subcutaneous layer. The dermis is a separate middle skin layer with connective tissue, collagen, elastin, glands, and hair follicles. So, the statement that the subcutaneous layer primarily contains adipose tissue that stores energy and provides insulation is correct.