Which layer of the epidermis is also known as the horny layer?

The stratum corneum is known as the horny layer of the epidermis due to its structure and function. This outermost layer is composed of dead skin cells that have become keratinized, meaning they are filled with keratin, a tough, protective protein. This layer acts as the first line of defense for the skin, providing a barrier against environmental damage, pathogens, and moisture loss.

The stratum corneum plays a critical role in maintaining skin hydration and preventing transepidermal water loss. Its ability to shed and replace cells continuously helps in maintaining skin health. Understanding the stratum corneum is essential for skincare professionals as it informs product selection and treatment approaches to optimize skin barrier function and overall skin health.