Inside layer of the hair shaft running down the center of the cortex.
Drawing
Color, Length, Diameter, Distribution, shape and
color intensity of pigment
granules, Scale types,Presence or absence of medulla, Medullary type, Medullary pattern, Medullary index
Grows about 0.5 mm per day or 1 centimeter per month; approximately one
half inch per month
hair that is dying and ready to fall out;
lasting two to six months
Questioned hairs must be accompanied by an adequate number of control samples. from victim from possible suspects from others who may have deposited hair at
the scene Control Sample 50 full-length hairs from all areas of scalp 24 full-length pubic hairs
Determined by measuring the diameter of the medulla and dividing it by the diameter of the hair. Medullary Index for human hair is generally less than 1/3. For animal hair, it is usually greater than 1/2.
Inner layer made
of keratin and imbedded
with pigment; also
contains air sacs called
cortical fusi.
The Cortex gives the hair its shape.
Drawing
Can be straight, curly or kinky depending on the cross-section, which may be round, oval or crescent-shaped, + drawing
The root contains nuclear DNA. If the hair has been forcibly removed, some folicular tissue may be attached containing DNA. The hair shaft contains abundant mitochondrial DNA, inherited only from
the mother. It can be typed by comparing relatives if no DNA from the body is available. This process is more difficult and costly than using nuclear
DNA.
It has three main layers, the epidermis, the dermis and the subcutaneous layer. The epidermis is an elastic layer on the outside that is continually being regenerated. It includes the following: Keratinocytes - the main cells of the epidermis formed by cell division at its base.
Verticales
hair is not growing; a resting phase
Outside covering of the hair shaft. It's made of overlapping scales.
Air spaces, usually found
near the root but may be found throughout
the hair shaft
The medulla is the hair core that is not always visible. The medulla comes in
different types and patterns.
Types:
Intermittent or interrupted, Fragmented, Continuous, Stacked, Absent—not present
The shaft is the visible part of the hair that sticks out of the skin. Composed of the cuticle, cotex, medulla
pigment granules that give hair its color
Easy to collect and store Is externally available Can provide information on the individual’s history of drug use or of poisoning. Collections must be taken from different locations on the body to get an accurate
timeline.
Human roots look different based on whether they have been forcibly removed
or if they are telogen hairs and have fallen out. Animal roots will vary, but in general
have a spear shape. + drawing
Drawing
hair that is actively growing; lasting up to 5
years
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