Massachusetts Board of Cosmetology Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

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Define "cortical layer" of hair.

The outer protective layer of hair

The inner layer that provides moisture

The middle layer providing strength and color

The cortical layer of hair is indeed the middle layer that provides both strength and color. It is situated between the outer cuticle and the inner medulla. This layer is composed of long, coiled proteins called keratin, which contribute to the hair's resilience and structural integrity. The cortex is also where melanin, the pigment responsible for hair color, is found. Variations in the amount and type of melanin within the cortex lead to differences in hair color among individuals. This layer is crucial for the overall appearance and physical properties of the hair, including its strength, elasticity, and ability to withstand damage.

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The layer responsible for hair texture

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