What serves as an anchor and holds the hair in the follicle?

The inner root sheath (IRS) is essential for anchoring hair within the follicle. It encases the hair strand as it grows, providing structure and support. The IRS not only protects the growing hair but also helps to shape it as it emerges from the follicle. This sheath adheres closely to the hair shaft, creating a connection that is vital for the hair’s stable positioning within the follicular structure.

Other components of the follicle, such as the outer root sheath, dermal papilla, and follicular bulb, serve different roles. The outer root sheath supports and protects the entire follicle but does not directly anchor the hair. The dermal papilla is crucial for providing nutrients and signaling for hair growth, and the follicular bulb is where new hair cells are formed. However, it is the inner root sheath that specifically acts as the anchor for the hair within its follicle.