What is the role of the inner structure of the hair shaft?

The inner structure of the hair shaft, primarily composed of the medulla and cortex, plays a crucial role in maintaining hair strength. The cortex, which makes up the bulk of the hair, contains keratin fibers that provide tensile strength and resilience. Additionally, the inner structure contributes to the overall integrity of the hair, enabling it to withstand various forms of manipulation and environmental stressors.

While some aspects related to hair structure may contribute to coloration or moisture retention, the primary function related to the inner structure is its ability to support and maintain the strength of the hair. Understanding this helps reinforce why maintaining hair health and strength is critical in cosmetology practices.