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Hair

  • Hair is made up of keratin.
  • Its is produced in hair follicles from cells originating in the matrix: a vascularized niche of stem cells.
  • When sectioned, hair shapes can be elliptical (short curly hair),  ovoid (wavy hair) or round (straight hair).
  • Each strand of hair is made up of the medulla, cortex, and cuticle.
    • The cortex is the thickest part, giving the hair its strength and color (contains melanin).
  • Hair disorders can be classified into scarring and non-scarring alopecia, in the latter case hair is absent but hair follicles remain mostly intact (common baldness, alopecia areata)
  • Sometimes the hair is damaged by external techniques (hair decolorization, hair straightening…)