Fibers
Hair Structure
Forensics
Hair Structure Cont.
Miscellaneous
100

What type of evidence would fibers be considered?

What is trace evidence 

100
These are fibrous proteins that form the main structure of hair
What is keratin
100
The actively growing root of a hair that contains DNA and living cells
What is the hair follicle
100
The hair stage where the follicle if dormant and hairs can easily fall out
What is the telogen stage
100

Curl, texture, or coarseness can all be determined by analyzing what?

What is the cross section of a hair

200
a fiber produced from a raw material such as coal or wood pulp that is spun together in a factory
What is synthetic fiber
200
bits of pigment fount in the cortex of hair
What is melanin granules
200
When fibers are transferred directly from victim to suspect or vice versa.
What is direct transfer
200
the stage where the follicle is growing and the cells around it are dividing and depositing materials
What is the anagen stage
200
skin layer just below the skin surface
What is the epidermis
300
a fiber produced naturally and harvested from animal, plant, or mineral sources
What is natural fiber
300
This is the outer layer of hair that has overlapping scales
What is the cuticle
300
If the victim has fibers on his person that he picked up and then transferred to a suspect.
What is secondary transfer
300
Hair is not growing; a resting phase
What is Catagen Stage
300
Determined by measuring the diameter of the medulla and dividing it by the diameter of the hair. Animal MI is 1/2 or greater. Human is 1/3 or smaller.
What is the Medullary Index
400
the most common natural fiber used in textiles?
What is cotton
400
This is the inner layer of hair that is made of keratin and contains pigment
What is the cortex
400
small but measurable amounts of physical or biological material found at a crime scene
What is trace evidence
400
Medullary index for humans is usually this much
What is Less than 1/3
400
you lose approximately one _____________________ hairs a day
What is one hundred
500

Describe one way we can analyze fibers to determine what they are composed of?

What is burning fibers, dying fibers, or analyzing fibers with a microscope

500
This is the inside layer of hair that runs down the cortex
What is the medulla
500
you can determine if some one is taking these from the chemical analysis of hair
What are drugs
500
For animal hair the medullary index is usually
What is greater than 1/2
500
Hair grows about...
What is 1 cm per month or one half inch per month
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