What is the term for the tube-like depression in the skin that contains the hair root?

The term that describes the tube-like depression in the skin containing the hair root is the hair follicle. The hair follicle is essential because it not only encapsulates the hair root but also plays a crucial role in hair growth and the health of the hair. It interacts with surrounding cells to facilitate the growth process, providing the necessary nutrients and environment for the hair to develop.

In contrast, the hair bulb refers specifically to the rounded part at the base of the hair follicle from which the hair grows. The hair shaft is the visible part of the hair that extends above the skin surface, and the hair stream describes the natural fall or direction of the hair in a particular area on the scalp. Each of these terms relates to different aspects of hair anatomy, but the follicle is the correct term for the structure that houses the hair root.