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Hair Definitions
Hair 2
Hair 3
Hair 4
Fibers
100
A central canal that runs through the hair.
What is the medulla?
100
The bottom of an individual hair, embedded in the follicle.
What is the hair root?
100
This is type of microscope that was used in our hair and fiber labs.
What is the light microscope?
100
This type of DNA is found in the hair shaft and strongly links a hair to a standard or reference hair?
What is Mitochondrial DNA?
100
The two broad categories for fibers.
What are natural and manufactured?
200
The patterned surface of the hair shaft.
What is the cuticle?
200
The entire hair that is clearly visible.
What is the hair shaft?
200
can you distinguish between a hair that has been bleached or dyed?
bleached shows damage to the cuticle and lacks pigment. Dyed hair shows a cuticle and cortex that looks as if it is painted
200
The medullary index of humans.
What is less than .5?
200
List the types of natural fibers
plant, animal & mineral
300
The middle layer of the hair, it contains pigments.
What is the cortex?
300
This substance give hair its color.
What is melanin?
300
A medula with a pattern in a single line.
What is Uniserial?
300
Hair is typically which type of evidence
trace and/or class
300
There are multiple ways to collect fibers what are they?
tape, lint roller, vacuum, forceps or tweezers
400
This ratio helps classify different type of hair and differentiate humans from other animals.
What is the medullary index?
400
The initial hair growth phase.
What is the anagen phase?
400
A medula with random shapes, no pattern.
What is a vacuolated medula?
400
Human hair can be both class and individual evidence, how is this possible
By having the follicle with the root tip attached
400
There is a distinguishing factor between natural and manufactured hair fibers, what is it?
medulla running up the middle
500
Hair grows out of this organ, an appendage of the skin.
What is the hair follicle
500
The follicular tag is a rich source of this important data.
What is hair DNA?
500
Intermittent or interrupted medulla is a regular pattern, whereas this type of medulla has segments of irregular length.
What is fragmented?
500
what is the approximate growth rate for hair?
what is .44cm a day or 1.3cm a month
500
Nylon, polyester, and acrylics are examples of this class of fibers.
What are synthetic fibers?