What is the primary role of the stratum lucidum in the skin?

The primary role of the stratum lucidum in the skin is to provide waterproofing. This layer is found only in certain areas of thick skin, such as the palms of the hands and soles of the feet. It consists of flattened, dead keratinocytes that are densely packed with a protein called eleidin, which helps in providing a barrier that reduces water loss from the body and protects the underlying layers of skin from external damage.

This waterproofing function is critical for preventing dehydration and maintaining overall skin health, allowing the skin to perform its protective roles effectively. The presence of the stratum lucidum enhances the skin’s resilience by adding an extra layer of protection, particularly in areas that experience significant friction and pressure.