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Hair Structure
Forensics
Hair Structure Cont.
Miscellaneous
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
kinky, curly, or coiled, pigment is densely distributed, cross section is flattened with moderate to small diameter
What is African Hair
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 primary 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
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 growth slows and stops

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
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 from your head

What is one hundred

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