L3.6.3: Hair

• • Produced by hair follicle
  • Root is enclosed in the follicle
  • Shaft projects from the surface of the scalp or skin
  • Consists of keratinized epithelial cells
  • Melanocytes produce pigment for hair color
  • Hair grows in the matrix of the hair bulb in stratum basale


  Hair
• HAIR ANATOMY

  ○ Medulla - center

  ○ Cortex - surrounds medulla

  ○ Cuticle - most heavily keratinized region of the hair
• 1. hair shaft
  2. arrector pili muscle
  3. sebaceous gland
  4. hair follicle
  5. hair root
  6. hair bulb in follicle

  A) 1

  B) 2

  C) 3

  D) 4

  E) 5

  F) 6

  
• 1. cuticle
  2. cortex
  3. medulla

  A) 1

  B) 2

  C) 3

  
• • Composed of an epithelial root sheath and fibrous sheath
  • Dermal region provides blood supply to the hair bulb (deepest part of the follicle)
  • Arrector pili muscle connects to the hair follicle to pull hairs upright when we are cold or frightened


  Hair follicle