Class or Individual?
Human
Hair as Evidence
Human Hair
100,000
50-100
trail
growing
class
root (follicle)
DNA
30
Hair can be different on different areas of the scalp.
In General...
Round
oval
Flat
Round
What is the color of your hair?
00:20
Hair Shafts have 3 layers. They are made of ____________ which makes the hair _________ and ________.
Keratin
Flexible
Strong
Medulla
- Cylinder of air down the center of the hair
- Might look like it isn't there
- only if its the same color as the cortex
Cortex
- This is the biggest part of the hair.
- Gives hair color with melanin.
- Darker hair = more melanin
Cuticle
- These protect and make hair waterproof.
- They overlap like shingles on a roof.
CUTICLE DESCRIPTION
Coronal cuticle- looks like cups or crowns stacked on top of each other.
- There are three different _______ that can be found on the outside of hair.
- Each is made up of ________.
- These are what we ____ when we look at hair.
patterns
Imbricate - Flattened, random overlapping scales.
protein
Spinous -longer, pointed scales.
see
Pigment Granule Distribution
Describing the Cortex
Smooth
- Grainules are not obvious
Granular
- Obvious granules- look like pencil dots
Spotty
- large dark blobs scattered throughout
Cuticles are made of melanin.
Describing the Cortex
Light BrownMedium Brown Dark Brown
Cortex Color Choices
Clear /Gray Light Yellow Medium Yellow Red
Describing the Medulla
Describing the Medulla
A microscope is used to determine the __________________of hair.
This is useful for comparing to suspect hair.
646
imagine
side
side
diameter
Hair can also be used to test for drug use!
Finding Diameter
Human Hair
Ashley Hinton
Created on October 17, 2024
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Transcript
Class or Individual?
Human
Hair as Evidence
Human Hair
100,000
50-100
trail
growing
class
root (follicle)
DNA
30
Hair can be different on different areas of the scalp.
In General...
Round
oval
Flat
Round
What is the color of your hair?
00:20
Hair Shafts have 3 layers. They are made of ____________ which makes the hair _________ and ________.
Keratin
Flexible
Strong
Medulla
Cortex
Cuticle
CUTICLE DESCRIPTION
Coronal cuticle- looks like cups or crowns stacked on top of each other.
patterns
Imbricate - Flattened, random overlapping scales.
protein
Spinous -longer, pointed scales.
see
Pigment Granule Distribution
Describing the Cortex
Smooth
Granular
Spotty
Cuticles are made of melanin.
Describing the Cortex
Light BrownMedium Brown Dark Brown
Cortex Color Choices
Clear /Gray Light Yellow Medium Yellow Red
Describing the Medulla
Describing the Medulla
A microscope is used to determine the __________________of hair. This is useful for comparing to suspect hair.
646
imagine
side
side
diameter
Hair can also be used to test for drug use!
Finding Diameter