Chapter 12: Forensic Hair Analysis

Actively growing phase of the hair; the follicle produces new cells and pushes them up the hair shaft as they become incorporated into the structure of the hair.

Appears as if a small explosion occurred in the middle of the hair and may be found singly or in multiples.

________ are found in the cortex and are dispersed variably throughout the cortex.

The structure within which hairs grow; it is a roughly cylindrical tube with a larger pit at the bottom.

Small bubbles that may appear in the cortex; when they do appear, they may be sparse, aggregated or evenly distributed throughout the cortex.

A narrowing of the hair to slightly less than the normal, nonshield shaft diameter.

The technical term for whiskers, the short to long, stiff, often white hairs around the snout and muzzle.

A tough protein- based material from which hair, nails, and horns are made in animals.

Hairs with colored rings.

Proportion of true results.

The portion that formerly was in the follicle, the proximal most portion of the hair.

Odd structures that look like very large pigment granules.

Proportion of true positives against all positive results.

Makes hairs look like a string of beads.

Lighter pigment.

True negative rate.

Human scale pattern.

Specialized cells in the follicle producing small colored granules that give hairs their particular color.

Monilethrix makes hairs look like a string of beads.

Transitional phase of the hair; the follicle begins to shut down production of cells, the cells begin to shrink, and the root condenses into a bulb-shaped structure called a root bulb or a club root.

Consists of spindle-shaped cells (fusiform) that contain or constrain numerous other structures.

Dark brown pigment.

A particular structure common only to mammals; they are the fibrous growths that originate from their skin.

A series of overlapping layers of scales that form a protective covering.

________ has a clean, straight border, whereas razor-cut hair is angled.

Thinner and softer which fill in the rest of the coat providing warmth and bulk.

A particular structure common only to mammals; they are the fibrous growths that originate from their skin

the hardening process of hair growth

Hair muscles

Actively growing phase of the hair;  the follicle produces new cells and pushes them up the hair shaft as they become incorporated into the structure of the hair

Specialized cells in the follicle producing small colored granules that give hairs their particular color

the resting phase for the follicle

The main portion of the hair

The distal most portion of the hair

A series of overlapping layers of scales that form a protective covering

Human scale pattern

Consists of spindle-shaped cells (fusiform) that contain or constrain numerous other structures

Small bubbles that may appear in the cortex; when they do appear, they may be sparse, aggregated or evenly distributed throughout the cortex

Odd structures that look like very large pigment granules

Appears as if a small explosion occurred in the middle of the hair and may be found singly or in multiples

Large, stiff hairs that make up the outer part of the animals coat

Hairs that do not fit into these categories; such as  those on the stomach, between the chest and the pubic region

an abrupt change in direction of the hair shaft with or without a slight twist

an asymmetrical cross section of hairs

True positive rate

True negative rate

Proportion of true negatives against all negative results

Proportion of true results