What is the function of the stratum lucidum in the skin?

The function of the stratum lucidum is primarily to enhance thickness on the palms and soles. This layer is found in thick skin regions, and it is an important adaptation for areas that experience more friction and abrasion. The stratum lucidum consists of a few rows of clear, flat, dead keratinocytes that provide an additional layer of protection beneath the outermost stratum corneum. This extra thickness gives areas such as the palms of the hands and soles of the feet greater resilience and durability, helping to withstand wear and tear from external forces.

In contrast, while other layers of the epidermis have specific functions such as producing keratin or providing structural support, the stratum lucidum specifically contributes to the overall thickness and protective quality of thick skin, enabling it to perform effectively in high-friction areas.