Which layer of the skin protects from the environment?

The epidermis is the outermost layer of the skin and serves as the primary barrier protecting the body from environmental factors. It acts as a shield against pathogens, harmful substances, and physical injuries. The epidermis is composed of multiple layers of cells, with the outermost layer, the stratum corneum, consisting of dead keratinized cells that provide additional protection.

While the dermis and hypodermis play important roles in supporting and nourishing the epidermis, they are located beneath the epidermis and are not directly exposed to the environment. The dermis contains blood vessels, nerves, and connective tissue, whereas the hypodermis primarily functions as a fat storage layer that insulates and cushions the body. The stratum corneum, while part of the epidermis, represents just one specific layer that contributes to overall skin protection. The epidermis as a whole is responsible for protecting the skin from environmental hazards.