Want to create interactive content? It’s easy in Genially!
Get started free
Human Hair
Ashley Hinton
Created on October 17, 2024
Start designing with a free template
Discover more than 1500 professional designs like these:
Transcript
Class or Individual?
Human
Hair as Evidence
50-100
pattern
400
trail
growing
100,000
1,000
Human Hair
Hair can be different on different areas of the scalp.
90
10
30
root (follicle)
class
DNA
blood
Round
oval
Round
Flat
In General...
00:20
What is the color of your hair?
Flexible
Strong
Keratin
Hair Shafts have 3 layers. They are made of ____________ which makes the hair _________ and ________.
Cuticle
- These protect and make hair waterproof.
- They overlap like shingles on a roof.
Cortex
- This is the biggest part of the hair.
- Gives hair color with melanin.
- Darker hair = more melanin
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
protein
patterns
Spinous -longer, pointed scales.
see
Imbricate - Flattened, random overlapping scales.
Coronal cuticle- looks like cups or crowns stacked on top of each other.
CUTICLE DESCRIPTION
- 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.
Describing the Cortex
Pigment Granule Distribution
Smooth
- Grainules are not obvious
Granular
- Obvious granules- look like pencil dots
Spotty
- large dark blobs scattered throughout
Cuticles are made of melanin.
Light BrownMedium Brown Dark Brown
Clear /Gray Light Yellow Medium Yellow Red
Cortex Color Choices
Describing the Cortex
Describing the Medulla
Describing the Medulla
Hair can also be used to test for drug use!
imagine
diameter
646
side
side
A microscope is used to determine the __________________of hair. This is useful for comparing to suspect hair.