• Pooya Khan Mohammad Beigi


Humans have up to five million hair strands that can be categorized into three different types: lanugo hair, vellus hair, and terminal hair Lai-Cheong (Medicine 41:317–320, 2013). Lanugo hair is only present for a small part of our lives and is soon shed after birth. Vellus hair is fine and soft in texture and is found all over the surface of the body. Terminal hair is longer and coarser and is only found on certain parts of the body such as the scalp, beard, and axillae.


Lanugo hair Vellus hair Terminal hair Hair follicle Inner hair sheath Outer hair sheath Dermal papilla Hair bulb Hair bulge Hair shaft Cuticle Cortex Medulla Anagen Catagen Telogen 


  1. 1.
    Lai-Cheong JE, McGrath JA. Structure and function of skin, hair and nails. Medicine. 2013;41(6):317–20.CrossRefGoogle Scholar
  2. 2.
    Watkins J. Alopecia, part 1: non-scarring forms. Pract Nurs. 2009;20(7):358–63.CrossRefGoogle Scholar
  3. 3.
    Qi J, Garza LA. An overview of alopecias. Cold Spring Harb Perspect Med. 2014;4(3):a013615.CrossRefPubMedPubMedCentralGoogle Scholar
  4. 4.
    Mounsey AL, Reed SW. Diagnosing and treating hair loss. Am Fam Physician. 2009;80(4):356–62.PubMedGoogle Scholar
  5. 5.
    Gilhar A, Etzioni A, Paus R. Alopecia areata. N Engl J Med. 2012;366(16):1515–25.CrossRefPubMedGoogle Scholar

Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Pooya Khan Mohammad Beigi
    • 1
    • 2
    • 3
  1. 1.Department of Health ManagementNew York Medical CollegeValhallaUSA
  2. 2.University of British ColumbiaVancouverCanada
  3. 3.Misdiagnosis AssociationSeattleUSA

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