Hairs

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  • Created by: molly_axx
  • Created on: 03-01-19 18:40

Macroscopic Features

-  Colour.

-  Length.

-  Form (straight, curly).

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Microscopic Features

-  Thickness.

-  Medulla.

-  Distal tip characteristics.

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Cuticle

-  Overlapping dead scale.

Coronal (crown-like).

Spinous (triangular).

Imbricate (flattened).

Damaged.

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Cortex

-  Ovoid bodies: large, solid, oval, pigmented.

-  Pigment Granules: pigmentation form melanin makes it darker.

-  Cortical Fusi: irregularly shaoed, dried out, mature hair roots.

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Medulla

-  Vacuolated: repeated patterns, dogs and horses.

-  Uniserial/Multiserial ladder: repeating pattern, multiple rows, rabbits and cats.

-  Lattice: circular structure, deer.

-  Continuous/Discontinuous: can be broken, humans.

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Distal Tips

-  Cut. 

-  Split/Frayed.

-  Damaged/Crushed.

-  Fine tip.

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Human Hair

-  Limb: fine shaft, tapered, soft.

-  Pubic: irregular shaft, wiry, continuous medulla.

-  Beard: coarse shaft, broad and continuous double medulla.

-  Chest: short, arc shaped, like pubic hair.

-  Eyebrow/Lash: curved, stubby, same structure as head hairs.

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Hair Life Cycle

1.  Anagen: active growth, rapid keratin production, nuclear DNA profiling.

2:  Catagen: transition phase, 1-3 weeks, papilla detatches from bulb.

3.  Telogen: resting phase, new hair grows, mitochondrial DNA profiling.

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Fibre Examination

-  Colour.

-  Texture.

-  Thickness.

-  Length.

-  Spinning method.

PICK, TAPE, SHAKE.

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Reference Samples

-  25-50 hairs.

-  Hairs if buccal sample isn't available.

-  60-70% chance of obtaining good DNA profile from hair.

-  30-40% saliva.

-  80-90% blood.

-  20% cellular.

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