Texas Class A Barber Written ExamAnatomy and PhysiologyMedium
A barber is explaining the importance of protecting the scalp from sun exposure. Which layer of the skin contains the melanocytes responsible for producing the pigment that shields against UV radiation?
- AStratum basale
- BStratum granulosum
- CStratum spinosum
- DStratum corneum
Show answer & explanationAnswer & explanation
Correct answer: A. Stratum basale
Melanocytes, the cells responsible for producing melanin (pigment), are primarily located in the stratum basale (also known as the stratum germinativum), the deepest layer of the epidermis. They transfer melanin to keratinocytes, providing UV protection.
Why the other options are wrong
- B. The stratum granulosum is involved in keratinization, but not primary melanin production.
- C. The stratum spinosum contains keratinocytes and some Langerhans cells, but melanocytes are not primarily found here.
- D. The stratum corneum is the outermost dead layer, primarily keratin.
Melanocytes in Stratum Basale
Melanocytes, the cells that produce the protective pigment melanin, are located in the deepest layer of the epidermis, the stratum basale.
- Melanin protects DNA from UV radiation.
- Melanocytes transfer melanin to keratinocytes.
- Determines skin and hair color.
Memory trick: Basal's melanin shields below the surface.