Which term describes the outermost layer of the skin?

Which term describes the outermost layer of the skin?

• A. Epidermis
• B. Dermis
• C. Papillary
• D. Reticular

Answer: (A)

The outermost layer of the skin is the epidermis, which serves as the protective barrier. It is avascular and made up of stratified squamous epithelial cells, with the topmost sublayer—the stratum corneum—consisting of dead, keratin-filled cells that form a tough, shed-able surface. Beneath it lie progressively differentiating layers that generate new cells, and melanocytes within the epidermis contribute to pigment. The dermis sits under the epidermis and provides strength and elasticity, containing blood vessels, nerves, and glands. Terms like papillary and reticular refer to regions within the dermis (the upper and deeper parts, respectively) and are not the outermost layer.

The outermost layer of the skin is the epidermis, which serves as the protective barrier. It is avascular and made up of stratified squamous epithelial cells, with the topmost sublayer—the stratum corneum—consisting of dead, keratin-filled cells that form a tough, shed-able surface. Beneath it lie progressively differentiating layers that generate new cells, and melanocytes within the epidermis contribute to pigment.

The dermis sits under the epidermis and provides strength and elasticity, containing blood vessels, nerves, and glands. Terms like papillary and reticular refer to regions within the dermis (the upper and deeper parts, respectively) and are not the outermost layer.