NIC Cosmetology Written (Theory) ExamScientific ConceptsHard
A cosmetologist is applying a facial mask. Which layer of the skin is primarily responsible for producing melanin, the pigment that determines skin color?
- AStratum corneum
- BStratum granulosum
- CStratum germinativum (basale)
- DStratum spinosum
Show answer & explanationAnswer & explanation
Correct answer: C. Stratum germinativum (basale)
The stratum germinativum, also known as the basal cell layer, is the deepest layer of the epidermis. It contains melanocytes, specialized cells that produce melanin, the pigment responsible for skin, hair, and eye color. This layer is also where new skin cells are generated.
Why the other options are wrong
- A. The stratum corneum is the outermost layer of the epidermis, composed of dead, flattened cells, and primarily functions as a protective barrier, not melanin production.
- B. The stratum granulosum is involved in keratinization and forms a waterproof barrier, but does not produce melanin.
- D. The stratum spinosum is characterized by desmosomes that give it a 'spiny' appearance and is involved in keratin production, but not melanin production.
Stratum Germinativum (Basale)
The deepest layer of the epidermis, responsible for cell division and melanin production.
- Contains melanocytes (melanin-producing cells).
- New skin cells (keratinocytes) are produced here through mitosis.
- Also known as the basal cell layer.
Memory trick: Epidermis layers are a 'GL' 'SB' – 'Granular', 'Lucid', 'Spiny', 'Basal'!