Chapter 12: Hairs and Fibers- Vocabulary Review

Catagen Phase

is a transformation between the other two phases of hair growth, and hair at rest

Telogan Phase

it is the final growth phase in which hair naturally falls out of the skin, hair that is dying

Nucleur DNA

this is the DNA that is present in the nucleus of a cell and that is inherited from both parents

Cuticle

this is the scale structure covering the exterior of the hair

Cortex

this is the main body of the hair shaft, it contains pigments and cortical fusi, gives hair its shape

Medulla

this is a cellular column running through the center of the hair, middle of hair, not always present in humans, and can be used to tell different species of animals apart, comes in both types and patterns

Follicular Tag

this is a translucent piece of tissue surrounding the hair's shaft near the root that contains the richest source of DNA associated with hair

Mitochondrial DNA

this DNA is present in small structures outside the nucleus of a cell. The small structures supply energy to the cell. This form of DNA is inherited maternally (from the mother)

Natural Fibers

these are fibers derived entirely from animal or plant sources

Manufactured Fibers

these are fibers derived from either natural or synthetic

Shaft

this part of the hair that sticks out of skin

Follicle

this is a structure from which hair grows, only part of hair that contains nuclear DNA

Root

this lies below the epidermis

Melanin

these are pigment granules in the cortex that give hair its color

Cotton

this is the most common plant fiber. It is strong, tough, flexible, moisture absorbent, not shape retentive

Wool

this is a protein/animal fiber usually from sheep, goat (mohair), rabbit (angora), camel, mink, beaver

Silk

this is spun by worms to make its cocoon, fiber reflects light and has insulating properties, protein/animal fiber

Asbestos

these are natural fibers that was used in fire resistant substances, mineral fiber

Yarn

these are individual threads made of fibers, tested for degrees of stretch, absorbency, water repellence, softness, and durability

Trace Evidence

this any small pieces of material, man-made or naturally occurring, and is usually hair or fiber

Nail Polish

this can be used to collect hair as evidence

Ramie

this comes from a vegetable plant fiber, less flexible

Rayen

this is a first man-made fiber, regenerated plant fiber, soft, lustrous, versatile, recycled plant fiber

Acetate

this is a less polluting and less expensive regenerated plant fiber than rayon

Nylon

this synthetic petroleum fiber that is more durable man-made fabric, extremely light weight

Polyester

this is the most widely used man-made fiber, synthetic petroleum fiber

What are four different types of weaves

plain, twill, satin, knit

What are two different plant fibers

cotton and ramie

What are two different animal fibers that are mostly made of protein

silk and wool

What are three mineral fibers that are studied in forensic

asbestos, metallis (mylor), fiberglass

Which of the following is NOT a common type of trace evidence

pistol

95% of fibers will be lost from a victim for crime scene in the first ___ hours

24

What structure helps your hair rise up when you are cold or nervous

arrector pili muscles

Which type of hair is NOT found on non-human animals

top coat

What is the protein that makes up nails and hair

keratin

Which kind of DNA can be extracted from cut hair

mitochondrial

At what location are hair oil produced

sebaceous gland

Fibers are most commonly which type of evidence

class

Satin is an example of what material

weave pattern

Which of the following is NOT a likely source of human hair

elbow

Which type of fiber is cotton

plant

Which part of the hair determines the color

cortex