Texas Esthetician License Practice Exam

The main function of the stratum corneum is to act as a barrier to protect the underlying layers of skin. This outermost layer of the epidermis is composed of dead skin cells that are tightly packed and filled with keratin, which contributes to the skin's protective capabilities. By forming a solid barrier, the stratum corneum prevents the penetration of harmful pathogens, chemicals, and physical irritants, while also reducing water loss from the body's deeper layers. This barrier function is essential for maintaining the overall health and integrity of the skin, ensuring that underlying structures remain intact and that moisture balance is preserved.

Other functions, such as producing oil for hydration or absorbing nutrients, are not associated with the stratum corneum. These activities are rather conducted by other skin structures, like sebaceous glands for oil production or the dermis for nutrient exchange. Additionally, while blood circulation is crucial for skin health, it primarily occurs within the deeper layers of skin and is not a function of the stratum corneum itself.