Iowa Cosmetology Practice Exam

The three layers of the hair structure are indeed the cuticle, cortex, and medulla. Each of these layers plays a vital role in the overall health, strength, and appearance of the hair.

The cuticle is the outermost layer of the hair, made up of overlapping protective cells that resemble roof shingles. This layer safeguards the inner structures of the hair and contributes to its shine and smoothness. When the cuticle is healthy and intact, it reflects light well, making the hair appear glossy.

Beneath the cuticle lies the cortex, which is the thickest layer of the hair shaft. The cortex is composed of long, keratin-based fibers that give hair its strength, elasticity, and color. The arrangement and density of these fibers can vary, influencing the texture and resilience of the hair.

The innermost layer, the medulla, is a soft, spongy core that may be absent in some types of hair. The medulla doesn't play a significant role in the properties of hair compared to the cuticle and cortex but can affect the hair's overall density and structure.

Understanding these layers helps professionals in the field of cosmetology make informed decisions regarding hair treatments and care, ultimately leading to healthier hair.