Where is the hair root located?

The hair root is located in the dermis, which is the layer of skin that lies beneath the epidermis. This area contains essential structures that are critical for hair growth and health, including blood vessels, nerves, and the hair follicles from which hair hairs originate. The dermis provides the necessary nutrients and support to the hair follicles, ensuring proper growth and development of hair strands.

The epidermis is the outermost layer of skin and primarily serves as a protective barrier, lacking the structures necessary for hair support. The hypodermis, also known as the subcutaneous layer, is primarily composed of fat and connective tissue, serving more of a cushioning and insulation role rather than housing the hair root itself. Therefore, the dermis is the correct answer, as it is the direct site of hair root location and is integral to hair follicle function.