NIC Cosmetology Written (Theory) ExamScientific ConceptsMedium
A cosmetologist is performing a chemical exfoliation treatment. The treatment uses an alpha hydroxy acid (AHA) to gently remove dead skin cells from the outermost layer of the epidermis. Which layer of the skin is primarily affected by this treatment?
- AStratum Corneum
- BStratum Granulosum
- CStratum Spinosum
- DStratum Basale
Show answer & explanationAnswer & explanation
Correct answer: A. Stratum Corneum
The stratum corneum is the outermost layer of the epidermis, consisting of dead, flattened keratinocytes. Chemical exfoliants like AHAs work by loosening the bonds between these dead cells, facilitating their removal.
Why the other options are wrong
- B. The stratum granulosum is below the stratum corneum and involved in keratinization, not the primary target for superficial exfoliation.
- C. The stratum spinosum is a deeper layer where cells begin to flatten and produce keratin, not the outermost dead cell layer.
- D. The stratum basale (or germinativum) is the deepest layer, responsible for cell production, and would not be the primary target of a gentle exfoliation.
Stratum Corneum
The outermost layer of the epidermis, composed of dead, flattened keratinocytes. It acts as a protective barrier and is the primary target for superficial exfoliation.
- Outermost layer of the epidermis
- Composed of dead keratinocytes
- Acts as a protective barrier
- Target for exfoliation
Memory trick: Come Let's Get Sun Burned (Corneum, Lucidum, Granulosum, Spinosum, Basale).