Hair

Aries Conley

BASIC STRUCTURE

The Structure of your hair has to do with the cells, muscle, skin, and the type of hair you have. Hair is composed primarily of 88% proteins. Once your hair and the roots are not connected anymore the hair becomes a dead cell.

The Cuticle is the outter most layer and it is made up of overlapping scales which protect the inner layers.

The Cortex is the next layer and it is made up of long thin cells, and it is the most important because it gives hair the elastic resilience, and contains the color pigment.

The Medula is a spongy tissue and cells sometimes contain granules of color pigment.





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HAIR CYCLE

The Hair Cycle has 3 steps it has to go through


1. Anagen- which is the growth stage of the hair.

This stage in the cycle is when the hair starts to grow. Then it enters the transitional stage. (1-2 weeks to go on to the catagen stage, grows approximately about 10 cm a day.)

2. Catagen- this is the transitional phase.

This part of the cycle is when hair follicles shrink about 1/6 of its normal length, the lower part is destroyed. Then it enters the resting stage. Your hair doesn't grow in this stage but it stays attached to the follicle. (5-6 weeks)

3. Telogen- is the resting stage of the.

This stage is the stage where your the hair follicle re-enters the first stage. The dermal papilla and the base of the hair join together and a new strand of hair begins to grow. If the old hair hasn’t shed, the new hair pushes the old hair out and the growth of cells start again.


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MEDULLARY INDEX

The Medullary Index is the ratio of the overall diameter of the hair shaft divided by the diameter of the medulla.


This formula helps you tell whether the hair is human or animal or not.

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HOW USED IN C.S.I. WORK

Helps investigators decide if the hair is human or animal, they tell this by looking at the medula, color, if it is straight/curly, damaged, split ends.