Derivates of skin - Hair

6 important questions on Derivates of skin - Hair

What are the two types of hairs on mammals?

  1. Underhair
  2. Guard hair

What is the function of underhair in mammals?

Underhair is for insulation and isolation

What is the function of guard hair?

Protection and coloration, guard hair can be modified to spikes or vibrissae.
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What are the 6 layers of a hair?

  1. Dermis
  2. External root sheath
  3. Internal root sheath
  4. Cuticula
  5. Cortex
  6. Medulla

What happens to a hair when it is deficient in cortex?

The hair is brittle, like deer.

What happens to the hair when it is deficient in medulla?

The hair is hollow, like polarbears.

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