Hair basics
This structure is the basic unit that produces all hair.
What is the follicle?
This layer of hair is the protective outer covering
What is the cuticle?
This is the stage of active hair growth
What is the anagen stage?
With the follicle present, this type of biological evidence can be recovered
What is DNA?
Dense animal hair is commonly referred to as this
What is fur?
On average, how many hairs are humans born with?
What is about 5 million?
This layer contains pigment granules and determines hair’s color and strength.
What is the cortex?
This is the short transitional stage of hair growth
What is the catagen stage?
This microscope allows side-by-side comparison of hair samples
What is a comparison microscope?
Human hair usually has this medullary index value or lower
what is 0.33?
This type of evidence describes hair when no follicle is attached.
What is class evidence?
This part of the hair shaft can be continuous, fragmented, or absent.
What is the medulla?
This stage accounts for about 12% of human hair and is when hair is easily shed.
What is the telogen stage
This type of microscope uses filters to detect treated or dyed hair
What is a fluorescence microscope?
Hair from this ancestry group often shows a continuous medulla
What is Native American or Asian?
The overlapping scales of the cuticle point in this direction
What is toward the tip end?
The pigment responsible for red and blonde tone
What is pheomelanin?
About what percentage of human hairs are in the anagen stage
What is about 85%?
This advanced technique can identify up to 14 elements in a single strand
What is Neutron Activation Analysis — NAA?
Investigators often compare these microscopic structures in the cuticle to distinguish species
What are scale patterns?
This process occurs when hair from one person or pet is transferred to another surface.
what is secondary transfer
The medullary index of animal hair is typically this value or greater.
what is 0.5?
If hair is forcibly removed, investigators may see this microscopic clue at the root.
What is a follicular tag or stretched tissue?
This microscope provides extreme surface detail, magnifying up to 50,000x.
What is an electron microscope?
This type of body hair is most often found at crime scenes, besides head hair
what is pubic hair?