What is the outermost layer of the skin called?

The outermost layer of the skin is known as the epidermis. This layer plays a crucial role in protecting the underlying tissues from external factors such as pathogens, chemicals, and physical injury. It is primarily composed of keratinized stratified squamous epithelium, which provides a tough barrier and is continually renewed as old cells are shed and replaced by new ones.

The dermis, located beneath the epidermis, contains connective tissue, blood vessels, and various skin appendages, while the subcutaneous layer, also known as the hypodermis, is composed mainly of fat and connective tissue. These layers support the epidermis but are not part of the outermost structure of the skin itself. Understanding the structure and function of the epidermis is essential for recognizing its protective role within the integumentary system.