What is the function of the hair cuticle?

The function of the hair cuticle is primarily to protect the inner layers of the hair. The cuticle consists of overlapping, scale-like cells that form a protective outer barrier for the hair shaft. This layer is crucial in shielding the underlying layers, such as the cortex and medulla, from damage due to environmental stressors like UV rays, heat, and chemical treatments.

A well-functioning cuticle helps to maintain the integrity and overall health of the hair by minimizing moisture loss and preventing the penetration of harmful substances. When the cuticle is damaged or worn down, the hair can become weak, frizzy, and more susceptible to breakage, highlighting the importance of this protective layer in maintaining healthy hair.