Hair structure is generally divided into three regions: the cuticle on the outside, the cortex, and then the medulla core. Hair is a field of cosmetic research in which much remains to be ...

Each hair can have three layers — the medulla, the cortex, and the cuticle. You can think of each hair like a tiny tree trunk. The innermost, or core layer, is the medulla.

Hair structure is generally divided into three regions: the cuticle on the outside, the cortex, and then the medulla core. Hair is a field of cosmetic research in which much remains to be ...

Hair structure is generally divided into three regions: the cuticle on the outside, the cortex, and then the medulla core. Hair is a field of cosmetic research in which much remains to be ...