Chapter 5: Hair Vocab Flashcards
(21 cards)
Locard Exchange Principle
There is always a cross transfer of evidence between suspect and victim or locale
Morphology
Form and structure
Polymer
Molecule consisting of many identical repeating units; polymers can be naturally occurring or synthetic
Cuticle
Tough, clear outside covering of the hair shaft
Cortex
Middle layer of the hair shaft that provides strength; comprises most of the hair mass
Medulla
Spongy, interior core of hair that gives it flexibility; appears as a canal in the middle of the shaft
Keratin
Tough protein polymer made up of about 20 different amino acids. The principle one is cystine, which allows strong disulfide bonds to form between protein chains
Cortical Fusi
Irregularly shaped air spaces in the cortex
Undulation
In hair morphology, slight waviness
Micrometer
One-millionth of a meter, or one-thousandth of a millimeter
Anagen Phase
Period of growth in the hair cycle, lasting about 3 weeks
Catagen Phase
Intermediate period of hair growth, lasting about 3 weeks
Telogen Phase
Final phase in hair growth, resulting in the loss of hair over about 3 months
Interference Patterns
Patterns that demonstate the wave nature of light, resulting from constructive and destructive combinations of light waves
Melanin
A natural pigment found in the skin.
Keratin pt. 2
Cross-Linking is what makes hair so resistant
Association
Link between an unknown sample and known evidence
Questioned
Used to describe a sample of unknown origin
Exemplar
Term used in forensics to describe an example of a known origin
Metabolite
Specific product of a substance, formed by chemical processes in the body
False Positive
A test result that comes out positive when it should not
