Which layer of the skin is the outermost protective barrier?

• A. Epidermis
• B. Dermis
• C. Stratum corneum
• D. Hypodermis

Answer: (A)

The outermost protective barrier of the skin is the epidermis. This layer sits at the very surface, shielding the body from environmental factors, while also helping to prevent water loss. Within the epidermis, the topmost sublayer called the stratum corneum is the main barrier against pathogens and dehydration, composed of flat, dead cells filled with keratin. But the epidermis as a whole is the skin’s outermost layer, whereas the deeper dermis provides structural support with collagen and elastin, and the hypodermis lies beneath, anchoring the skin to underlying tissues.