Washington Esthetician State Board Practice Exam

Where is the stratum lucidum primarily located?

1. On the forehead

2. On the palms of hands and soles of feet

3. On the back of the hands

4. On the neck

The correct answer is: On the palms of hands and soles of feet

The stratum lucidum is a thin, transparent layer of skin found primarily in areas where the skin is subject to friction and pressure. Its presence is most notable on the palms of the hands and the soles of the feet, where it serves as an additional protective barrier. This layer helps to provide extra durability and prevents damage to the underlying tissues in these high-wear areas. The nature of the stratum lucidum, being a feature of thick skin, explains its absence or minimal presence in other areas of the body such as the forehead, back of the hands, and neck, which comprise thinner skin where this layer is not necessary for protection or function. The unique structure and composition of the stratum lucidum contribute to the overall resilience and functionality of the skin in these specific locations, making the palms and soles the primary sites for its occurrence.