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
Compare Crime Scene Alex Garcia
Compare Crime Scene Doug Greene
Compare Crime Scene Erica Piedmont
Compare Crime Scene Lucy Leffingwell
Compare Crime Scene Anna Garcia
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
Crime Scene Alex Garcia
Crime Scene Doug Greene
Crime Scene Erica P.
Crime Scene Lucy L.
Crime Scene Anna Garcia
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.
Crime Scene Alex Garcia
Crime Scene Doug Greene
Crime Scene Erica P.
Crime Scene Lucy L.
Crime Scene Anna Garcia
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