What is the primary function of the stratum corneum in the skin?

The primary function of the stratum corneum is to act as a barrier against infection and dehydration. This outermost layer of the epidermis is composed of dead skin cells that are tightly packed together, forming a protective shield. It plays a critical role in preventing the loss of moisture from the body, which is essential for maintaining skin hydration and overall skin health. Additionally, by serving as a barrier, it protects underlying layers from pathogens, allergens, and environmental harmful factors, thus reducing the risk of infections.

The stratum corneum's structural integrity and its ability to retain moisture and keep harmful substances out are vital for the skin's overall functioning. The thickness and efficiency of the stratum corneum can vary depending on factors such as location on the body and individual differences, but its fundamental role remains focused on barrier protection. This understanding underscores the importance of maintaining a healthy stratum corneum as a cornerstone of effective skin care.