1. Anatomy of Hair

2. This is a cross section of a hair showing all three layers

3. Image of a Hair Follicle

4. Each Follicle contains a muscle and a sweat gland
Arrector Pili – the
muscle that lifts your hair
on end when you’re cold
or scared

5. Sebaceous gland – produces oily secretion that cleans hair

6. Dermis – follicle sits in the dermal layer
Directly beneath the epidermis. Packed with nerve endings and blood vessels

7. Hair Follicle – the organ of hair growth

9. Layers of Hair Follicle
Internal and External Root Sheath – molds and forms growing hair
Papilla – Actively dividing cells that produce hair
Blood Vessels – feed the growing hair
Bulb – Bottom of Hair Follicle – contains the papilla and blood vessels
Hair Shaft – Made up of Cuticle, Cortex, Medulla

10. Layers of the Hair Follicle

11. The Cuticle of Human Hair is rough --- which is why we use Conditioner

12. Human, Cat, Dog, Mouse
Animals have characteristic cuticle scales that scientists can use to determine the source of hair evidence

13. Pigment cells are found in the medulla and the cortex

14. Cat

15. Rabbit

16. Rabbit
Cuticle
Pattern >

17. Deer

18. Human

19. Ovoid bodies found in Dog Hair

20. Ovoid bodies are abundant in Cattle hair

21. Hair is made of Protein
Hair is made of keratin