What is the main function of sebaceous glands found in the dermis?

The primary function of sebaceous glands, located within the dermis of the skin, is to produce an oily substance known as sebum. This oil serves several important purposes, predominantly lubricating both the skin and hair, which helps to keep them moisturized and protected. By creating a film on the skin's surface, sebum prevents excessive water loss, contributes to maintaining skin hydration, and improves barrier function against external irritants and pathogens.

Additionally, the oily nature of sebum reduces friction on hair, making it shinier and easier to manage. These properties are essential in maintaining skin health and integrity, especially in preventing conditions associated with dryness, such as eczema or dermatitis. Thus, the role of sebaceous glands in the dermis is pivotal for the overall maintenance of healthy skin and hair.