Hair Evidence
The number of hairs that we typically shed in a day
What is 40–125?
Length, color, and curliness
What are macroscopic properties of hair?
The main two parts of a hair
What are the follicle and the shaft?
What is melanin?
Ratio of the diameter of the medulla to the diameter of the entire hair
What is the medullary index?
The type of evidence classification if a hair has a root present.
What is individual evidence?
Three microscopic properties of hair
The three subdivisions of the hair shaft
What is absent, continuous, interrupted, and fragmental?
The equation to determine the medullary index
What is width of medulla divided by diameter of hair?
The molecular structure contained within the hair root that can eliminate suspects or pinpoint a criminal.
What is the DNA?
The fibrous protein that makes hair strong and flexible
What is keratin?
Name at least two characteristics of the cuticle
What are outer layer, transparent, made of overlapping scales?
Six regions from which hair originates
What is head, eyebrow/lash, beard, pubic, underarm, and body?
The type of hair if the medullary index is 0.50 or greater
If there is no root present, hair is classified in this way
What is class evidence?
The direction that the scales point on the hair shaft
What is toward the end of the hair (away from the scalp)?
Name at least two characteristics of the cortex
What is middle layer of shaft, largest part, contains pigment that gives hair its color?
True or False...Ethnic groups have unique characteristics related to their hair
What is true?
The medullary index of a human hair
What is less than or equal to 0.33?
The three main functions of hair
What are temperature regulation, to act as a sensory organ, and protection?
This famous person's death was investigated using hair analysis
Who was Napoleon?
Name at least two characteristics of the medulla
What is the center of the shaft, difficult to see with cheap microscope, different classifications?
Two ways human hair differs from animal hair
What is medullary index and cuticle type?
The test used to determine the presence of toxins and chemicals in the hair
What is Neutron Activation Analysis?
The type of microscope best suited to look at evidence hair and suspect hair at the same time
What is a Comparison Microscope?
Type of microscope capable of magnifying a sample up to 50,000 times
What is an Electron Microscope?
The effect that keratin has after death
What is "makes hair resistant to decomposition"?
Two ways hair can be destroyed
What are fire and certain chemicals?
The medullary index of a medulla that is 58 microns wide and a cortex that is 110 microns wide
What is 0.53?