Oregon Cosmetology Hair Practice Test 2026 – Complete Exam Prep

The three primary levels of the hair consist of the cuticle, cortex, and medulla, which are essential components of a hair strand.

The cuticle is the outermost layer made up of flat, overlapping cells that protect the inner layers. Its condition significantly influences the overall health and appearance of the hair, affecting shine and smoothness.

The cortex lies beneath the cuticle and is the thickest layer, responsible for the hair's strength, color, and texture. It contains fibrous proteins and melanin, which gives hair its pigment.

Lastly, the medulla is the innermost layer, though it may not be present in all hair types. It is a soft, spongy layer that contributes to the hair’s overall structure. Understanding these layers is crucial for cosmetologists, as they impact hair treatment methods and the choice of products used in hair care and styling.