NIC Barber Written (Theory) ExamScientific ConceptsHard
A barber is explaining the function of different skin layers to a client. The client asks which layer is primarily responsible for producing melanin, the pigment that gives skin and hair its color. Which epidermal layer should the barber identify?
- AStratum Spinosum
- BStratum Basale
- CStratum Granulosum
- DStratum Corneum
Show answer & explanationAnswer & explanation
Correct answer: B. Stratum Basale
The Stratum Basale (also known as the stratum germinativum) is the deepest layer of the epidermis and contains melanocytes, the cells responsible for producing melanin.
Why the other options are wrong
- A. The Stratum Spinosum is characterized by desmosomes and keratinocytes beginning keratin production.
- C. The Stratum Granulosum contains keratinocytes that are flattening and losing their nuclei.
- D. The Stratum Corneum is the outermost protective layer, composed of dead keratinocytes.
Stratum Basale (Epidermis)
The deepest layer of the epidermis, composed of a single layer of cuboidal or columnar cells, including keratinocytes (undergoing mitosis) and melanocytes (producing melanin).
- Also called stratum germinativum.
- Site of new cell production (mitosis).
- Contains melanocytes for pigment production.
Memory trick: Come, Let's Get Sun Burned! (Corneum, Lucidum, Granulosum, Spinosum, Basale)