Forensics- Ch. 3 Hair As Evidence

Front 1

human hair

Back 1

One of the most frequently found pieces of evidence at the scene of a violent crime

Front 2

3

Back 2

The average human replaces their head hair in a cycle of this many years

Front 3

class

Back 3

Without follicle cells attached, it is not possible to show with any certainty that two hairs came from the same person or animal, therefore it is considered what type of evidence?

Front 4

tape lift

Back 4

This method is used to collect hair evidence when there are many hairs in a small area

Front 5

vacuum

Back 5

This method is used to collect hair evidence when there are many hairs in a large area

Front 6

insulate

Back 6

The main purpose of hair is to regulate body temperature by doing this

Front 7

fur

Back 7

In many mammals, hair can be very dense, and it is then referred to as this

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cortex

Back 8

The middle layer of the hair shaft that provides strength and contains granules of color pigment

Front 9

cortical fusi

Back 9

Irregularly shaped air spaces in the cortex of hair

Front 10

cuticle

Back 10

The tough, clear, outer covering of hair composed of overlapping scales

Front 11

follicle

Back 11

The actively growing root or base of a hair

Front 12

keratin

Back 12

Protein that makes hair strong and flexible

Front 13

medulla

Back 13

Spongy core of a hair fiber that gives it flexibility

Front 14

metabolite

Back 14

A specific product of a substance, formed by chemical processes in the body

Front 15

class

Back 15

Hair is considered this kind of evidence

Front 16

secondary transfer

Back 16

When hair is moved from the source, to one item, to another item

Front 17

animal

Back 17

Secondary transfer is common with what type of hair evidence?

Front 18

paper bindle

Back 18

Package used to hold hair evidence

Front 19

papilla

Back 19

A network of blood vessels that supply nutrients to hair and help it grow

Front 20

sebaceous

Back 20

Gland in skin to secrete oil

Front 21

erector

Back 21

Muscles in skin that cause hair to stand upright

Front 22

shaft

Back 22

Region of hair composed of the cuticle, cortex and medulla

Front 23

eumelanin

Back 23

Pigment granules which give color to brown and black hair

Front 24

pheomelanin

Back 24

Pigment granules which give color to blonde and red hair

Front 25

continuous

Back 25

A medulla pattern that consists of an unbroken line of color

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interrupted

Back 26

A medulla pattern that consists of a pigmented line broken at regular intervals

Front 27

fragmented

Back 27

A medulla pattern that consists of a pigmented line that is both broken and unevenly spaced

Front 28

exclusion

Back 28

Term used when it has been determined that hairs do not have a common origin

Front 29

fifty

Back 29

Number of hairs collected from a suspect's head for comparison

Front 30

anagen

Back 30

Stage of active hair growth; Approx. 85% of all human hair is in this stage

Front 31

catagen

Back 31

Transitional stage where hair growth slows; accounts for about 2% of all hair growth and development

Front 32

telogen

Back 32

Final stage of the hair cycle in which hairs fall out; about 12% of all hairs are in this stage which lasts a few months

Front 33

distal

Back 33

Tips of hair that can give clues to treatments or last hair cut

Front 34

razor

Back 34

Hairs cut with this tool have a long tail on one side of the cut

Front 35

clippers

Back 35

Hairs cut with this tool have broken and partially cut shafts

Front 36

bleaching

Back 36

Hairs that have had this treatment have a yellowish tint and are brittle

Front 37

medullary index

Back 37

Equation helpful to distinguish between a human and other animal hair

Front 38

animal

Back 38

If the medullary index is 0.5 or greater, the hair came from this source

Front 39

human

Back 39

If the medullary index is 0.33 or less, the hair came from this source

Front 40

coronal

Back 40

Type of scales that resemble a stack of paper cups; commonly found in the fur hairs of small rodents and bats

Front 41

imbricate

Back 41

Type for overlapping scales with narrow margins; commonly found in human hair

Front 42

spinous

Back 42

Type of triangular, protruding scales; commonly found in the fur hairs of mink, seals, and cats

Front 43

electron

Back 43

A type of microscope that magnifies a specimen 50,000 times or more; provides incredible detail of the surface or interior of evidence

Front 44

fluorescence

Back 44

A type of microscope equipped with filters to detect shined light, indicating the presence of a dye or other treatment

Front 45

comparison

Back 45

A microscope that allows the side-by-side comparison of hair samples

Front 46

follicular tag

Back 46

When hair is forcibly removed, this is often attached at the base

Front 47

individual

Back 47

When hair has DNA in the follicle, it is considered this type of evidence

Front 48

six

Back 48

Forensic scientists distinguish this many types of hair on the human body (be able to name them all)

Front 49

head, pubic

Back 49

The two most common types of hair found at crime scenes

Front 50

dissolved

Back 50

In order to test hair for drugs and other chemicals, what first needs to be done to it?

Front 51

neutron activation analysis

Back 51

This technique can identify up to 14 different elements in a single two centimeter-long strand of hair

Front 52

coin envelope

Back 52

Package that can be used to hold hair evidence when a paper bindle is not available