Hair Structure - PowerPoint PPT Presentation

hair structure n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Hair Structure PowerPoint Presentation
Download Presentation
Hair Structure

play fullscreen
1 / 24
Hair Structure
430 Views
Download Presentation
isolde
Download Presentation

Hair Structure

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Hair Structure

  2. Cuticle – Human Hair

  3. Cuticle – Oragutan hair

  4. Human Orangutan

  5. Slight Lifting Normal cuticle

  6. Cuticle damage by overperming

  7. Asian hair is straight and thick, and resists damage well

  8. Caucasoid hair can be anything from blond to black in color, and may be curly, wavy or straight

  9. African hair is vulnerable to damage, because of its shape and twisted structure

  10. Hair Bulb

  11. Hair follicle

  12. Hair shaft

  13. Brush down Brush up

  14. Hair strength

  15. Hair growth Cycle

  16. The phases of the hair growth cycleIt is easy to remember the lengths of the different phases ofthe growth cycle. Very roughly speaking:           anagen 1000 days (or more) catagen    10 days  telogen   100 daysThe hair growth cycle, showing the changes from the growing of a new hair (anagen) to its shedding (telogen): notice how in anagen the hair bulb lies deep inside the scalp and then rises towards the surface before the hair is shed, then moves down again as the new hair grows

  17. A method of measuring the rate of hair growth: both cut hairs and newly emerging hairs can be seen

  18. Differences in hair length depend on the length of anagen, which is genetically determined. These two people started off with hair of the same length and went without a haircut for 18 months: the man's hair grows only to his collar before it falls out naturally, but the woman's anagen period is clearly much longer

  19. Electronmicrograph showing new hairs emerging from the hair follicles of the scalp

  20. Zinc deficiency Normal

  21. Hair density patterns

  22. Normal Telogen Phase haircompound e- micrograph

  23. An anagen hair that has been plucked out: notice the soft, sticky tail

  24. A hair, carrying some normal fragments of debris, seen under the electron microscope