1. Lesson Aims List the different parts of the hair
Explain how hair grows
Differentiate between different types of hair

2. Hair Function
Grows all over the body except soles of feet and palms of hand
Protection – eye lashes, eye brows, nose and ear hair
Body hair keeps us warm and protects against sunlight
Protects against friction

3. Hair Structure Made from protein called KERATIN Dead structure
Hair divided into 3 different parts:
- Hair shaft
- Hair root
- Hair bulb

4. Hair Shaft Visible part showing above the skin
Protects against sunlight, dust, sweat dripping into eyes
Keeps you warm

5. Hair Root Found under the skin Not visible Surrounded by a Root sheath
At the bottom of the root is the bulb

6. Hair Bulb Found at the base of the hair root
Bulb is where cells grow and mitosis happens
Mitosis – cell division

7. Hair Root Sheath Found surrounding the hair root
Inner and outer root sheath
Outer sheath forms follicle wall
Cells constantly dividing
Allows follicle to renew cells throughout life cycle
Inner sheath responsible for anchoring the hair
Important for shaping the hair
Important for making the hair smooth

8. A small tubular cavity containing the bulb of the hair
Hair Follicle
A small tubular cavity containing the bulb of the hair

9. Dermal Papilla Found within the hair bulb Connective tissue
Contains blood vessels
Provides blood to help hair grow

10. Hair Matrix Surround the dermal papilla
Contains the cells that divide and create the hair shaft and root

11. Hair Bulge
Located in the outer root sheath at the insertion point of the arrector pili muscle
It has several types of stem cells, which supply the entire hair follicle with new cells, and take part in healing the epidermis after a wound

12. Layers of Hair

13. There are three stages to hair growth: Anagen Catagen Telogen

14. Hair Growth: Anagen Active growing stage
Lasts few months to several years
Hair germ cells reproduce at matrix
New follicle is produced
Extends in depth and width
Hair cells pass upwards
Form hair bulb
Cells keep rising up follicle, pass through bulb and form structure of the hair
Inner root sheath grows with hair and anchors

15. Hair Growth

16. Catagen Phase between the active and resting phase
Lasts two to four weeks
Hair separates from dermal papilla and moves slowly up the follicle
Follicle begins to shrink
Inner root sheath dissolves and hair can be brushed out

17. Telogen Resting phase Hair is shed on the skins surface
New replacement hair begins

19. There are 2 main types of hair Vellus hair Terminal hair

20. Vellus Soft, downy unpigmented hair
Found over most of the body except soles of feet, palms of hand, lips and genitals
When stimulated by puberty, vellus hair can grow into terminal hair

21. Terminal Longer, darker, coarser hair
Found on scalp, under arms, eyebrows, pubic regions
Adult hair growth