Fibers
Hair Structure
Forensics
Hair Structure Cont.
Miscellaneous
100
These are fibers that have been spun together
What is yarn
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

curly, or coiled, pigment is densely distributed, cross section is flattened with moderate to small diameter

What is African 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 found 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
this fabric is made by interlocking the loops into a specific arrangement
What is knitted fabrics
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

A curved root placement generates it.

What is curly hair?

?

M
e
n
u