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Hair structure

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Hair structure

  1. 1. 3/1/2013 Academy of Hairdressing and Beauty TAFE WSI 0 Hair Structure The Main Functions and role of the hair •Thermo regulation – helps retains body heat •Physical protection – acts as a buffer to knocks and abrasions •Provides a good environment for micro organisms – increased warmth, moisture and sebum under hair
  2. 2. Layers of the Hair The hairshaft consists of 3 layers 1. MEDULLA 2. CORTEX 3. CUTICLE
  3. 3. MEDULLA •Centre layer of hairshaft •Not always present. Can be continuous or broken •Made up of large loosely connected cells •May contain melanin •no known function Source: hair
  4. 4. CORTEX •Largest & most important layer of the hairshaft •Determines the texture of the hair •All chemical & physical changes take place here •Melanin is found here – permanent colour changes take place in the cortex Source: hair
  5. 5. CUTICLE •The outer layer •Made up of clear overlapping scales •Contains no melanin •2 to 11 layers thick •Protects the cortex •Determines the hairs porosity Source: hair
  6. 6. The Hair Follicle The follicle is a pocket of skin and grows deep into the dermis and consists of the following: 1. PAPILLA 2. GERMINAL MATRIX 3. HAIR BULB
  7. 7. The Papilla •Found below the follicle in the dermis •Is located at the base of the follicle •Is where the CAPILLARIES pass nutrients through to dividing cells in the germinal matrix •Where the waste products from the cell are passed back through to the capillaries and taken away Source: hair follicle
  8. 8. Source: hair follicle The Germinal Matrix Inside the follicle above the PAPILLA Were the cells divide ( Mitosis) Each cell already knows if it is a cortex, cuticle or medulla Melanin is produced in the cells within the germinal matrix Cells are being pushed upwards as new cells are produced Once the cell leaves the germinal matrix its supply of nutrients is cut off so he cells stop dividing and dies
  9. 9. Source: hair follicle The Hair Bulb •Bulb shape located at the lower end of the follicle •The germinal matrix is found in the hair bulb •Keratinisation occurs here
  10. 10. Sebaceous Gland •Attached to the side of the follicle •Secretes oil (sebum) •Helps hair stay supple and shiny •Sebum forms part of the acid mantle that helps protect the skin from harmful bacteria and chemical attackSource: hair follicle
  11. 11. Arrector Pili Muscle •Attached to the follicle and the base of the epidermis •Involuntary muscle – cannot control it •Contracts due to cold or fright creating goose bumps Source: hair follicle

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