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Flashcards in Hair And Fiber Deck (24):
1

Cortex

The region of a hair located outside of the medulla containing granules of pigment

2

Cuticle

The tough outer covering of hair composed of overlapping scales

3

Hair follicle

The actively growing root or base of a hair containing DNA and living cells

4

Medulla

The central core of a hair fiber

5

Melanin granules

Bits of pigment found in the cortex of a hair

6

Trace evidence

Small but measurable amounts of physical or biological material found at a crime scene

7

Direct transfer

The passing of evidence, such as fiber from victim to suspect or vice versa

8

Fiber

The smallest indivisible unit of textile, it must be at least 100 times longer than wide

9

Natural fiber

A fiber produced naturally and harvested from animal, plant or mineral sources

10

Synthetic fiber

A fiber made from a man made substance, such as plastic

11

Secondary transfer

The transfer of evidence , such as fiber from a source to a person, and then to another person

12

Textile

A flexible, flat material made by interlacing yarn

13

Yarn

Fibers that have been spun together

14

Comparison microscope

A compound microscope that allows the side by side comparison of samples such as hair and fibers

15

What are the 3 different types of medullas of hair

Absent
Fragmented
Continuous

16

What are the 3 types of cuticles of hair?

Spinous
Coronal
Imbricate

17

What are 2 differences between animal and human hair?

In animal medulla is present for all animals and cuticle is spinous or coronal

In humans there can be no medulla and the cuticle is imbricate.

18

Which cuticle patterns are NEVER found in humans?

Spinous

19

What kind of evidence are fibers? Why

CLASS evidence because fibers can't be assigned to a single person or thing.

20

What kind of evidence is hair?

Class evidence because it cannot be used to identify a specific individual.

21

Are rayon, polyester, nyon, acrylic, and olefin natural or synthetic fibers?

Synthetic fibers

22

Are wool, silk and cotton synthetic or natural fibers?

Natural fibers

23

What are other ways that you can analyze fibers

Burned test
Polarized light microscopy, or infrared spectroscopy and tests for solubility in different solutions

24

What are 2 major differences between synthetic and natural fibers?

All natural fibers come from nature however synthetic fibers are man made

All natural fibers tend to be expensive however synthetic fibers tend to be inexpensive

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