Biomed Mr Rahmani HAIR Hair strands found at

Biomed Mr. Rahmani

HAIR • Hair strands found at a crime scene can often provide clues for investigators. • At the microscopic level, hair shafts are composed of three layers: the cuticle, the cortex, and the medulla

Cuticle • The cuticle is the outermost layer of the hair • When comparing hair samples, there a number of microscopic characteristics associated with the cuticle, such as the thickness of the cuticle, the variation in the thickness, the presence of pigment, and the color. • Also, the nature of the outer cuticle margin may be smooth, looped, ragged, or damaged.

Cuticle

Cortex • Home to the pigment-containing granules responsible for hair color and contains many of the characteristics used in the microscopic analysis of hair. • The organization, density, size, and distribution of the pigment granules vary greatly between individuals • Middle layer

Medulla • Innermost layer of hair • This layer may be continuous, discontinuous, fragmentary, or even absent • The diameter of the medulla is a useful characteristic in the identification and comparison process.

Medulla

Hair found at crime scene

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Fingerprint • Because no two people have the same fingerprints (not even identical twins), a fingerprint found at a crime scene is a useful way to match a suspect with the crime scene • Fingerprints are the tiny raised spiral and concentric patterns called ridges found on the tip of each finger. • All of the ridges of fingerprints form patterns called loops, whorls, and arches

Types Plain Arch Tented Arch

Types Radial Loop Whorl

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Shoeprints • A shoeprint left at a crime scene can help investigators match a potential suspect to a crime. Almost all footwear bears undersoles with distinctive patterns. • As a shoe is worn, certain details fade in different places depending on the weight and walk of the owner. Specific damage may be caused to a shoe due to these factors. • The size of the shoe can also be obtained from a shoeprint.

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