What is attached to the hair follicles?

The sebaceous gland is an important structure associated with hair follicles. It is responsible for producing sebum, an oily substance that helps to lubricate and protect both the hair and the skin. The sebaceous glands are located in the dermis layer of the skin and typically open into the hair follicle, which allows the sebum to travel along the hair shaft and coat both the hair and the scalp. This natural oil is crucial for maintaining hydration, preventing dryness, and providing a barrier against environmental factors.

In contrast, the hair bulb is the part of the hair follicle where hair growth begins. The dermis is the layer of skin that contains the hair follicles, but it is not directly attached to them, as it supports the structures rather than being an attachment itself. The epidermis is the outermost layer of skin that covers the entire body, and while it contains hair follicles, it is not specifically attached to them. Thus, the sebaceous gland's function and relationship with hair follicles make it the correct choice in this context.