Hair Anatomy
A network of blood vessels that supply nutrients to feed the hair and help it grow
What is Papilla
The central core of the hair
What is the Medulla
How often does a full head of hair get replaced?
What is Every third year?
The hair shaft is composed of what important protein?
What is Keratin
The average hair grows how much per month?
What is 1.3 cm
Club-shaped structure in the skin from which hair is produced
What is Follicle
The layer of hair that contains pigment granules
What is Cortex
What hair color has the least amount of hairs?
What is red hair?
This layer of hair is made of scales that overlap and point toward the distal tip
What is cuticle
What is the first step in testing the hair shaft for substances such as drugs?
What is dissolving the hair
Gland which secretes oil and causes hair to be oily
What is Sebaceous
The part of hair which can be analyzed for DNA
What is Follicular Tag
When you transfer hair from the crime scene to a different location.
What is secondary transfer
Human hairs generally have what two types of medulla?
What is Fragmented or none
Hair without the root is considered what type of evidence?
What is class evidence
Muscles that cause hair to stand upright
What is Erector
Transparent outer layer of the hair
What is Cuticle
The main purpose of hair is to
What is regulate body temperature
When hairs found at a crime scene look very different from hairs collected from a suspect, this is called
What is exclusion
When being compared to a wooden pencil, which part of hair represents the wood?
What is the cortex
Small sacs of air within the hair shaft
What is Cortical Fusi
Hair with a round cross section and a large diameter
What is straight (Asian)
What stage of life do humans have the most hair on their body?
What is when they are born
When collecting hairs from a suspect to compare to those found at a crime scene, how many control hairs should be collected?
What is 50 from head; 25 from pubic region
How long does it take for newly cut hairs to take on an uncut, rounded shape?
What is around 2-3 weeks