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Glossary Cuticles

Cuticles are the thin, protective layers of overlapping cells that form the outermost part of the hair shaft. They play a crucial role in maintaining hair health by protecting the inner layers from damage, moisture loss, and environmental factors. In the context of hair loss, damaged or raised cuticles can lead to increased hair fragility and breakage, exacerbating thinning or loss. Healthy cuticles contribute to the overall strength and appearance of hair, making their condition an important factor in hair biology.

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research Acidic and basic hair/nail ("hard") keratins: their colocalization in upper cortical and cuticle cells of the human hair follicle and their relationship to "soft" keratins.

356 citations , December 1986 in “The journal of cell biology/The Journal of cell biology”

This study found that specific human hair keratins are differentially expressed in the hair follicle, suggesting a shared pathway of epithelial differentiation between hair cortex and nail plate cells.

research The cracking of human hair cuticles by cyclical thermal stresses

15 citations , January 1998

This study found that repeated cycles of wetting and blow-drying hair fibers can cause cracks in the hair cuticles, particularly among individuals who frequently blow-dry their hair.

research A highly resistant structure between cuticle and cortex of human hair

10 citations , November 2016 in “International Journal of Cosmetic Science”

This study proposed the existence of a membrane-like structure between the cuticle and cortex in human hair, which may provide strong protection against external stimuli.

research Mechanism of Cuticle Hole Development in Human Hair Due to UV-Radiation Exposure

8 citations , March 2018 in “Cosmetics”

In this study, researchers found that UV radiation causes hydroxy radicals to form cuticle holes specifically between the cuticle layers in wet hair, unlike random holes caused by Fenton's reaction.

research Topographical and Tribological Characteristics of Asian Human Hair Cuticles

3 citations , January 2015 in “Mathematical problems in engineering”

This study found that heating damages Asian black male and female hair cuticles without altering their structure, with damage severity increasing at higher temperatures and longer exposure times.

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