CSI Hair

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28 Terms

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Morphology

The form and structure of hair.

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Hair

Protein polymers made up of repeating units, can be natural or synthetic.

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Cuticle

The tough, clear covering of the hair shaft.

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Imbricate

Refers to a pattern similar to broken glass.

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Spinous

A hair structure characterized by bundled spines.

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Coronal

A stacked crown pattern found in hair.

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Cortex

The middle layer of hair that gives strength, mass, and color.

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Keratin

A tough protein polymer made up of 20 amino acids.

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Melanin

The pigment that gives color to hair.

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Medulla

The spongy interior of the hair shaft.

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Fragmentary

Refers to a medulla that is less than half.

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Interrupted

Refers to a medulla that is more than half.

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Continuous

Refers to a medulla that is entirely present.

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Stacked

A term describing multiple scales found only in animal hair.

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Human medulla

Can be fragmentary, interrupted, or continuous.

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Animal medulla

Can be continuous or stacked.

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Medullary index

A ratio of medulla to total hair diameter.

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MI for humans

Less than 1/3.

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MI for animals

Greater than 1/2.

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Round

Head shape characteristic of Asian or Native American hair.

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Oval

Head shape characteristic of European, Mexican, or Middle Eastern hair.

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Crescent moon

Head shape characteristic of African hair.

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Association

The link between an unknown sample and a known sample.

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Questioned

A sample of unknown origin.

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Exemplar

A sample of known origin.

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Metabolite

A product formed by chemical processes in the body.

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False positive

When hair absorbs chemicals from its surroundings leading to incorrect conclusions.

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Cheiloscopy

The study of lip prints.