What is the outermost layer of the skin called?

The outermost layer of the skin is known as the epidermis. This layer serves several critical functions, including acting as a protective barrier against environmental factors like bacteria, chemicals, and physical abrasions. It is comprised mostly of keratinocytes, which produce keratin, a key protein that helps maintain skin integrity and strength. The epidermis also plays a role in regulating water loss and provides some degree of protection from UV radiation.

Understanding the structure and function of the epidermis is essential in skincare, as many treatments and products are designed to enhance and maintain the health of this outer layer. The communication between the epidermis and deeper skin layers, such as the dermis, is also vital for overall skin health, as it supports cell turnover and the regeneration of skin cells.

The dermis, subcutaneous layer, and hypodermis refer to layers beneath the epidermis, each with its own function, such as providing structural support, housing blood vessels, and storing fat, but they are not the outermost layer of the skin.