Hair Disorders – Simple Problem But most Embarrassing

INTRODUCTION – HAIR

Hair – Anatomy

– Partially live and partially dead, belongs to integumentary sy

– Follicle part (root) live and shaft part dead

STRUCTURE OF HAIR

hair structure

 

Skin

– 7 layers – 2 dermal layers, 5 epidermal layers

– Dermis – 2 layers – Reticular and Columnar layers

– Extension of dermis – follicle, Extension of Epidermis – hair shaft

hair

DESCRIPTION OF THE LAYERS

hairshaft 2               hair2

  • Reticular dermis – Rich in blood vessels
  • Columnar dermis – Filled with cells, extra – cellular matrix, gluten
  • Follicle – root of the hair – contains hair matrix, dermal papilla
  • Dermal papilla – seat of the follicle, connectivity between the hair follicle and shaft, presence of androgen receptors
  • Hair matrix – contains stem cells, keratinocytes and melanocytes
  • Stem cells – mother cells producing new undifferentiated cells
  • Keratinocytes – normal cells – contains melanin pigment and other nutrients and forms as a shaft
  • Melanocytes – produces melanin pigment
  • Interstitial spaces – present in between dermal papilla through which the cells squeeze out to form shaft
  • Arrector pilli muscle – supports the hair shaft and keeps the hair erect
  • Sebaceous gland – secretes sebum, regulates body temperature, lubricates and avoids friction

PARTS OF SHAFT

hair shaft                       cs hair

 

 

cs hair 2

  • Cuticle – Outermost, Discontinuous, transparent layer
  • Cortex – Contains keratinocytes
  • Medulla – Functionally not significance not defined

 PHYSIOLOGY/ FUNCTIONS OF HAIR:

  • Protective
  • Excretory
  • Beauty

CYCLES/ PHASES OF HAIR GROWTH:

hair cycle                                              hair 3 stages

  • ANAGEN – GROWTH PHASE
  • CATEGEN – INTERMEDIATE PHASE
  • TELOGEN – RESTING PHASE
  • RE- ANAGEN – REGROWTH PHASE

stages of hair

TYPES OF HAIRS

  • VELLUS HAIRS:
  • Lifeless Hair
  • Elasticity of Arrector Pilli is lost
  • Colorless
  • Forms as question mark
  • Tends to fall hair
  • Strength less hair
  • Latin – Vellus -“a fleece” or “wool”

hair development

  • INTERMEDIATE HAIRS:
  • Phase of conversion of vellus hair into terminal or vise versa

types of hair

  • TERMINAL HAIRS:
  • Good hair
  • Strengthened hair

Regarding Hair disorders and remedies – please wait for the next post 🙂

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