What is the function of corneocytes in the epidermis?

Corneocytes are the terminally differentiated cells of the epidermis, primarily found in the outermost layer known as the stratum corneum. Their primary function is to act as a protective barrier for the skin. This is achieved through their role as a structural component that helps maintain the integrity of the skin by keeping the layers of cells closely packed together. Acting as "cellular glue," corneocytes help limit water loss and prevent the entry of harmful substances, thereby contributing to the skin’s overall health and defensive capabilities.

While cell division occurs in the deeper layers of the epidermis, such as the stratum basale, and UV protection is typically provided by melanin and other compounds, corneocytes do not perform energy production for skin cells. Instead, their primary role centers around enhancing the barrier function of the skin, making option A the most suitable choice.