Which of the following layers of skin is the outermost protective layer?

The outermost protective layer of the skin is the Stratum Corneum. This layer is composed of dead keratinized cells that have lost their nuclei and are primarily made up of keratin, a tough protein that helps protect underlying tissues from environmental damage, pathogens, and water loss. Its structure provides a formidable barrier, making it key in preventing dehydration and exposure to harmful substances.

As the outermost layer, the Stratum Corneum continuously sheds and renews itself, ensuring that the skin remains resilient and adaptable to external factors. This turnover process is essential for maintaining skin health and integrity.

In contrast, the Stratum Malpighii (also known as the basal layer) and basal layer are involved in processes such as cell division and the generation of the newer layers of skin. The dermis, located beneath the epidermis, contains blood vessels, nerves, and connective tissue but is not considered an outer layer of skin.