What is the role of the cortex in hair structure?

The cortex of the hair structure plays a crucial role in providing strength and determining the hair's color. Comprising a significant portion of the hair shaft, the cortex is the dense, fibrous protein layer situated between the outer cuticle and the inner medulla. This layer contains keratin fibers, which give the hair its tensile strength and elasticity, allowing it to withstand everyday wear and tear.

In addition to contributing to the strength of the hair, the cortex is responsible for housing the melanin pigments that give hair its color. Different combinations and concentrations of these pigments result in the wide variety of hair colors seen in individuals. Therefore, the health and quality of the cortex are essential for maintaining the hair's structural integrity and desired appearance.