Hair & Fiber Review

hair is mostly composed of _________

protein

DNA can sometimes be extracted from the _________ adhering to the hair root

follicular tag

irregularly shaped air spaces in the cortex are called

cortical fusi

hair can be use to determine the length of poisoning or drug usage bc the hair grows at a constant rate of about

1 cm a month

the pigment which provides color to a hair sample is made up of

melanin

the cuticle is made up of

overlapping scales

the cortex is the inner layer made up of

keratin

the 3 basic patterns of the cuticle are

coronal, spinous and imbricate

the cuticle gives the hair

shape

the cortex has 2 main characteristics

melanin and the cortical fusi

types of the patterns in the medulla are

stacked, absent and fragmented

the medullary index is determined by

measuring the diameter of the medulla and dividing it by the diameter of the hair

catagen

hair is not growing

logen

hair that is dying and ready to fall out

chemicals in the bloodstream may be transferred to the growing hair to be

stored in the follicle

follicular tag is a

translucent piece of tissue surrounding the hairs shaft (near the root)

the hair shaft itself can provide

mitochondrial DNA

fibers are made up of

twisted filaments

natural fibers

animal, vegetable or inorganic

synthetic fibers

synthesized or created from altered natural sources

what are the odds of head hair originating from 1 person to another if similar

4500 to 1

the age and sex of hair can be determined ONLY if

you have DNA & the follicular tag

tissue from a hair follicle that is still attached to the root end of a hair

follicular tag