What is the dermis?

The dermis is known as the living layer or true skin, which lies beneath the outermost layer called the epidermis. This layer plays a crucial role in supporting and nourishing the skin. It is made up of connective tissue that contains collagen and elastin fibers, giving it strength and elasticity. The dermis houses essential structures such as blood vessels, sweat glands, hair follicles, and nerve endings, all contributing to the skin's overall function and health.

This understanding distinguishes the dermis from the other options. The outermost layer of skin refers to the epidermis, while the layer of fat beneath the skin corresponds to the hypodermis or subcutaneous layer, which primarily serves as insulation and energy storage. Although the dermis is involved in healing due to its rich supply of blood vessels and cells like fibroblasts, the defining feature of the dermis is its status as the true living layer of the skin where vital processes occur.