3. Can only compare head hair to head hair or pubic hair to another pubic hair Control hairs from suspect: 50 full length head hairs minimum of 24 pubic hairs

4. Resistant to decomposition and maintains its structure.

5.  The average human body has about 5 million hairs!

6. The average number of Brown/Black scalp hairs: 100,000!

7. On the average, the human scalp has 100,000 hair follicles. You are born with as many hair follicles as you are ever going to have!

10. 50 - 100

11. Between 15 and 30 years of age

13. 0.35 mm/day or about 1 cm/month

14. In summer

15. NOVEMBER

17. Structure from which hair grows Lies below epidermis Can differentiate Between species Sticks out of skin

19. The organ that hair grows out of

20. 1. The CUTICLE is the outside covering

21. The cuticle protects the cortex

22. Scale patterns are not useful forensically because the scale patterns in humans are the same

23. In animals, a variety of scale patterns are found bat mink deer

24. Scales always point toward the tip of hair (1) mosaic

30. The bulk of each hair’s mass is contained in the cortex.

31. contains the various proteins and bonds which determine the curliness or straightness of the hair.

32.  Pigment granules that give hair its color

33. Air spaces Usually found near the root But can be found Throughout the Hair shaft

34. -Formed by cells running through hair -Amorphous in appearance

35. = diameter of medulla diameter of hair The medulla is approximately.005 mm In width This hair is. 030 mm in diameter The Medullary Index =.005 mm.030 mm = 1/6

36.  Vary from one individual to another  And even between hairs of one person Human hair Medulla index < 1/3 in other animals: ½ or greater

37. continuous fragmented absent Interrupted or intermittent

38. (1) Uni serial (2) multi serial

39. Mountain lion

42. Hair as Evidence Determine… 1. Human or animal? In Humans: Medullary Index < 1/3 In Other Animals: Medullary Index ≥ 1/2

43. Negroid hairs Negroid or African origin hairs are usually curly with a flattened cross section and appear to be curly, wavy, or coiled.

44. Caucasoid or Caucasian origin hairs are normally fine to medium coarseness, oval cross-section, straight or wavy in appearance, and colors range from blonde to brown to black.

45. Mongoloid or Asian origin hairs are normally coarse, straight, with a wider diameter than hairs of the Caucasoid and Negroid hairs. The outer layer of the hair is usually much thicker than that of the other racial groups.

46. a. Scalp hairs - all about the same diameter b. Beard hairs - coarse, blunt tips c. Pubic hairs - short, curly

47. Forcibly removed hair will include the root tip

48. contains tissue surrounding hair shaft Contains DNA!!

49. a. roots

51. Removes color, yellow tint

52. Hair testing is considered accurate and can go back as far as 90 days

53. 1. Color, straight vs wavy vs curly, etc.

54. of medulla

55. In the cortex

57. Vitamin deficiency fungus nits (lice) Or diseases

58. Function of the root – nourishment for hair growth

59. A. TERMINOLOGY Phases of growth 1. anagen - the root is attached to the follicle GROWTH PHASE lasts 2-6 yrs 90%of hair is in anagen

61.  The root bulb shrinks  The growth rate decreases  Lasts 2-3 weeks

63.  RESTING phase  2-6 months

64. Is also called the SHEDDING phase

65. 50 – 100 hairs per day

66. For 2 – 5 years

67. 85% - 90%