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Forensic Science: Fundamentals & Investigations, Chapter 3 1 Chapter 3 The Study of Hair By the end of this chapter you will be able to: o Identify the.

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Presentation on theme: "Forensic Science: Fundamentals & Investigations, Chapter 3 1 Chapter 3 The Study of Hair By the end of this chapter you will be able to: o Identify the."— Presentation transcript:

1 Forensic Science: Fundamentals & Investigations, Chapter 3 1 Chapter 3 The Study of Hair By the end of this chapter you will be able to: o Identify the various parts of a hair o Describe variations in the structure of the medulla, cortex, and cuticle o Distinguish between human and nonhuman hair All Rights Reserved South-Western / Cengage Learning © 2012, 2009

2 Forensic Science: Fundamentals & Investigations, Chapter 3 2 Chapter 3 The Study of Hair By the end of this chapter you will be able to: o Determine if two examples of hair are from the same person o Explain how hair can be used in a forensic investigation o Calculate the medullary index for a hair

3 Forensic Science: Fundamentals & Investigations, Chapter 3 3 History of Hair Analysis 1. 1883: Alfred Swaine Taylor and Thomas Stevenson covered hair in a forensic science text 2. 1910: Victor Balthazard and Marcelle Lambert published a comprehensive study of hair 3. 1934: Dr. Sydney Smith, analyzed hairs side by side 4. Today: chemical tests, neutron activation analysis, and DNA analysis

4 Forensic Science: Fundamentals & Investigations, Chapter 3 4 The Function of Hair o Regulates body temperature o Decreases friction o Protects against sunlight

5 Forensic Science: Fundamentals & Investigations, Chapter 3 5 The Structure of Hair o A follicle embedded in the skin produces the hair shaft o Three layers (illustrated above): the inner medulla the cortex the outer cuticle

6 Forensic Science: Fundamentals & Investigations, Chapter 3 6 The Structure of Hair

7 Forensic Science: Fundamentals & Investigations, Chapter 3 7 Cuticles, Cortex, and Medulla

8 Forensic Science: Fundamentals & Investigations, Chapter 3 8 Types of Cuticle and Cortex o Cuticle: the outermost layer over-lapping scales that protect the inner layers o Cortex: Thickest layer Contains most of the pigment Distribution of pigment varies Usually denser nearer the cuticle

9 Forensic Science: Fundamentals & Investigations, Chapter 3 9 Types of Medulla

10 Forensic Science: Fundamentals & Investigations, Chapter 3 10 Types of Hair Buckled Blunt Double Medulla o A cross section: circular, triangular, irregular, or flattened o Shape: influences the curl of the hair o Texture: coarse or fine

11 Forensic Science: Fundamentals & Investigations, Chapter 3 11 Types of Hair Human hair varies on the body Head Eyebrows Lashes Mustache Beard Underarms Body hair Pubic

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