What is the role of the stratum corneum in the skin?

The stratum corneum serves a crucial role as the outermost layer of the skin, effectively acting as a protective barrier. This layer is composed of dead skin cells that have become flattened and keratinized, forming a resilient shield that protects underlying tissues from external environmental threats such as pathogens, chemical irritants, and physical abrasions. Additionally, the stratum corneum helps to prevent transepidermal water loss, maintaining skin hydration and integrity.

While elements such as nourishment and temperature regulation are functions of the deeper layers of the skin, and melanin production occurs in the melanocytes found in the epidermis, the stratum corneum primarily focuses on offering protection and barrier functions essential for overall skin health.