Oregon Esthetician State Board

Which layer of the epidermis forms our unique fingerprints?

1. Stratum corneum

2. Stratum lucidum

3. Stratum granulosum

4. Stratum spinosum

The correct answer is: Stratum lucidum

The layer of the epidermis responsible for forming our unique fingerprints is the stratum lucidum. This layer is found only in specific areas of the body, such as the palms of the hands and the soles of the feet, where the skin is thicker. The stratum lucidum consists of several layers of dead keratinocytes, which help to provide a protective barrier. The unique patterns of fingerprints are determined by the underlying dermal papillae, which are projections from the dermis that create ridges and grooves in the overlying epidermis. These structures become part of the stratum lucidum and contribute to the distinctive patterns we recognize as fingerprints. Understanding the role of the stratum lucidum in the formation of fingerprints highlights its significance in skin texture and individuality. While the other layers of the epidermis play vital roles in skin health and protection, they do not specifically contribute to the unique identification patterns found on fingertips as the stratum lucidum does.