Which layer is composed of fat tissue for insulation and cushioning?

• A. Dermis
• B. Epidermis
• C. Stratum granulosum
• D. Subcutaneous layer

Answer: (D)

Fat tissue that provides insulation and cushioning is found in the subcutaneous layer (also called the hypodermis). This layer sits beneath the dermis and is mainly adipose tissue, which stores fat, helps regulate temperature, and cushions the skin and underlying structures. It also anchors the skin to deeper tissues and contains larger blood vessels.

The dermis, located beneath the epidermis, is the strong, elastic layer that holds hair follicles, sweat glands, and nerves, but it is not primarily fat. The epidermis is the outer protective layer made of keratinized cells and has no fat storage. The stratum granulosum is a specific, thin layer within the epidermis involved in keratinization, not fat storage.

Thus, the subcutaneous layer is the layer composed of fat tissue for insulation and cushioning.