Parts of Hair
These are the 3 layers of the hair shaft.
What are the cuticle, the cortex and the medulla?
This is the initial phase of hair growth of hair.
What is the anagen phase?
The cortex is composed of this protein.
What is keratin?
Describe the medulla of a human head hair.
Hair is considered this type of evidence.
What is class evidence?
This is the largest portion of the hair shaft.
What is the cortex?
This is considered the transitional phase of hair growth.
What is the catagen phase?
These are the three classifications of medullae.
What are continuous, interrupted and fragmented?
In animal hair, the medulla is ________ than the medulla in human hair.
What is greater than?
Hair that is pulled from the source quickly will have more or less sheath cells present in comparison to that of a hair pulled slowly from the source.
What is more sheath cells?
This is the clear outer layer of the hair shaft, often referred to as scales.
What is the cuticle?
This is the final stage of hair growth, where hair naturally falls out.
What is the telogen phase?
This is the pigment that gives hair its color - located in the cortex.
What is melanin?
Describe the medullae of an animal hair?
What is interrupted or continuous?
True or false; all hairs from a human head will have the same characteristics.
What is false?
This is the canal that runs through the middle of the hair shaft, is not always present in a given hair sample.
What is the medulla?
The active phase of hair growth typically lasts this long.
What is up to 6 years?
This portion of the hair is connected to blood flow and takes in drugs and poisons that can be detected in the hair for long periods of time.
What is the follicle?
Which characteristic of hair is most important when determining if hair is an animal hair or human hair?
What is scale patterns?
What must be present on a hair sample in order to directly link the sample to an individual?
What is the follicular tag?
This part of the hair that is the club shaped structure that is located in the skin.
What is the follicle?
Hair typically grows at this rate per month.
What is 1 cm per month?
This is a method that is used to test hair samples for different elements present in the hair.
What is NAA or Neutron Activation Analysis?
Describe the medulla pattern in cats.
What is pearl shaped?
This is the process where hairs are attached to other objects and transported from the crime scene to another location.
What is secondary transfer?