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Exogen phase of hair life cycle


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Exogen phase of hair life cycle

  1. 1. EXOGEN PHASE OF HAIR LIFE CYCLE Dr Anastasios Vekris, MD Plastic Surgeon
  2. 2. HAIR LIFE CYCLE <ul><li>CLASSICALLY: </li></ul><ul><li>1. Anagen phase </li></ul><ul><li>2.Catagen phase </li></ul><ul><li>3.Telogen phase </li></ul><ul><li>(resting) </li></ul>It contains a new phase: THE EXOGEN phase
  3. 3. The hair follicle phases
  4. 4. EXOGEN PHASE or hair shedding <ul><li>Leads to the release of telogen club </li></ul><ul><li>Results in hair shedding </li></ul><ul><li>The two components of the resting phase (telogen and exogen) polpulation can be discriminated </li></ul><ul><li>Method: non-invasive approach </li></ul><ul><li>Contrast-Enhanced phototrichogram (CE-PTG) Differences between the roots </li></ul>
  5. 5. The exogen phase
  6. 6. Characteristics of hair root <ul><li>In anagen and telogen phase : </li></ul><ul><ul><li>Hair is firmly anchored to the hair follicle- </li></ul></ul><ul><ul><li>The cohesion forces are correlated with hair thickness </li></ul></ul><ul><ul><li>Telogen clubs retain cellular element of the outer root sheaths </li></ul></ul><ul><li>In exogen phase : </li></ul><ul><ul><li>hair are passively retained within the hair follicle </li></ul></ul>
  7. 7. Characteristics of the exogen phase <ul><li>On any given day, every human being looses about 50-150 hairs due to the exogen phase. </li></ul><ul><li>Roughly 1% of the hair in the telogen phase falls out every day. </li></ul><ul><li>Casual levels of exogen hair is <7/cm 2 </li></ul>
  8. 8. Conclusion <ul><li>The exogen phase is a subphase of the telogen phase, during which the hair falls out . </li></ul><ul><li>The details of the exogen mechanism are poorly understood, but it certainly influences the anagen phase. </li></ul><ul><li>Understand ing of the natural cycles of hair growth can help us to treat hair loss </li></ul>