hair

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  • Hair
    • structure of hair
      • thread-like growth
        • shaft
          • less likely to get DNA from
          • buckling shaft
          • splitting shaft
          • convoluted shaft
        • root
          • present
            • anagen
              • active growth stage
              • good for DNA analysis
              • seen when there has been a struggle (hair pulled out)
              • cells present round end of rot
            • catagen
              • intermediate stage
                • root is mature
                  • may get DNA from it
            • telogen
              • final stage
                • falls out naturally
                  • cells have no nucleus - dead cells
          • absent
            • root cut off
      • made up of three features
        • cuticle
          • outer layer
          • composition
            • coronal
              • animal
            • spinous
              • animal
            • imbricate
              • no fixed pattern
                • human and animal
          • profile
            • smooth
            • serrated
            • ragged
        • medulla
          • central core
            • opaque
            • translucent
            • continous
            • interrupted
        • cortex
          • pigmentation surrounding medulla
            • pigment density
            • pigment distribution
            • pigment shape/size
          • cortical fusi
          • ovoid bodies
    • characteristics of hair
      • length
      • colour
      • shaft profile
      • root
      • tip
    • types of hair
      • scalp hair
        • most common
        • width of hair is measured
        • medulla, pigment size and distribution analysed
      • pubic hair
        • common in sexual attacks
        • usually pigmented
        • course and wiry appearance
      • moustache hair
        • thick coarse hair
        • wide medulla
        • triangular in cross-section
      • eyebrow hair
        • curved and coarse
        • often has thick medulla
        • strongly pigmented

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