NIC Cosmetology Written (Theory) ExamScientific ConceptsMedium
A client is concerned about their hair appearing dull and feeling rough. A cosmetologist performs a hair analysis and determines that the outer layer of the hair, which protects the inner structure and determines porosity, is damaged. Which part of the hair structure is the cosmetologist referring to?
- ACuticle
- BMedulla
- CCortex
- DHair Bulb
Show answer & explanationAnswer & explanation
Correct answer: A. Cuticle
The cuticle is the outermost protective layer of the hair, composed of overlapping scales. Damage to the cuticle can lead to dull, rough-feeling hair and affect its porosity.
Why the other options are wrong
- B. The medulla is the innermost core of some hair types, not related to dullness or roughness.
- C. The cortex is the middle layer, providing strength and elasticity, and contains melanin, but is protected by the cuticle.
- D. The hair bulb is the base of the hair follicle, where hair growth begins, not a part of the hair shaft directly related to texture and dullness.
Hair Cuticle
The outermost protective layer of the hair shaft, composed of overlapping, scale-like cells.
- Protects the inner cortex and medulla.
- Determines hair's porosity (ability to absorb moisture).
- Damage results in dullness, roughness, and frizz.
Memory trick: Hair has a 'CM C'ore – Cuticle, Medulla, Cortex.