At the lower end, a follicle expands into a cluster of cells from which the hair grows. What is this cluster of cells called?

The cluster of cells from which the hair grows is termed the hair bulb. This structure is located at the base of the hair follicle and is crucial for hair production. Within the hair bulb, a specific group of cells known as keratinocytes rapidly proliferates and differentiates to form the hair shaft.

The hair bulb serves as the living part of the hair as it contains the dermal papilla, which supplies blood and nutrients essential for the growth of the hair. The interaction between the cells in the hair bulb and the dermal papilla plays a pivotal role in the hair growth cycle.

Understanding this part of hair anatomy is essential for anyone involved in waxing practices or hair removal, as it informs practices related to hair growth cycles and the health of hair follicles.