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Hair Structure: The Facts



What is hair?

Explain hair structure?

This page answers all your questions about the structure of human hair.

And you can also learn about the TRUE cause of androgenetic alopecia (male pattern baldness and female pattern baldness). The true underlying mechanism for this condition has now been identified as "skull expansion".

You can quickly learn about skull expansion, how it causes hair loss and how the hair loss industry got it wrong by reading:

"Skull Expansion - True Cause of Genetic Hair Loss".

This ebook is completely FREE!

Click here to download your copy.

(A download page will open in a new window).



Hair Structure

The diagram opposite shows a cross section of a hair shaft. Note the following:

  • Hair is made from dead protein cells (keratin).
  • A strand of hair has three layers:
    the cuticle (outer layer), the cortex (middle layer) and the medulla
    (inner layer).
  • The medulla is a honeycomb keratin structure with air spaces within it.
Cross section of hair
  • The cortex gives flexibility and tensile strength to hair and contains melanin (giving hair its colour). Without melanin, the partly hollow hair appears grey.
  • The cuticle is made from 6 to 11 layers of overlapping semi-transparent scales (which make the hair waterproof and allow it to be stretched). Someone with thick, course hair will have more overlapping layers of cuticles that someone with fine hair.
  • The hair structure is such that a healthy hair shaft will be very strong: it can stretch up to 30% of its length, absorb its own weight in water, and swell up to 20% of its diameter.



Click here to learn about the Hair Growth Cycle.

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