NIC Nail Technician Written ExamScientific ConceptsMedium
The stratum corneum is the outermost layer of the epidermis. What is its primary function in relation to nail health and overall skin protection?
- ATo provide a waterproof barrier against external threats.
- BTo produce melanin for skin pigmentation.
- CTo generate new skin cells through mitosis.
- DTo house nerve endings for sensory perception.
Show answer & explanationAnswer & explanation
Correct answer: A. To provide a waterproof barrier against external threats.
The stratum corneum consists of dead, flattened cells filled with keratin, forming a tough, protective layer that prevents water loss and acts as a barrier against pathogens and environmental damage.
Why the other options are wrong
- B. Melanin production occurs in the stratum basale (melanocytes).
- C. New skin cells are generated in the stratum basale (germinativum).
- D. Nerve endings are primarily found in the dermis and deeper epidermal layers.
Stratum Corneum
The outermost layer of the epidermis, composed of dead, flattened keratinocytes, forming a protective, waterproof barrier for the body.
- Composed of dead skin cells (corneocytes).
- Provides protection against dehydration, abrasion, and microbes.
- Continuously sheds and is replaced from deeper layers.
Memory trick: Corneum is like a 'corn'erstone, protecting from all sides.