ancestry pt II

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Author:
kevindevriendt
ID:
180631
Filename:
ancestry pt II
Updated:
2012-10-31 12:06:22
Tags:
anthroscopic traits
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Description:
anthroscopic traits
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  1. anthroscopic traits?
    related to ancestry - very difficult to identify
  2. asian classified under?
    amerindian
  3. areas of skull most diagnostic for acestry, which areas most important
    1. nose
  4. Nose - importance?

    root ?
    bridge?
    most useful for determining ancestry

    root= where nasal bone meets frontal bone

    bridge- ridge of bone formed by nasal bone

    spine- bone projecting from floor of nasal aperature
  5. shape of lower border?
    hole part as the bottom of the base of the nose
  6. white nose

    asian nose

    black nose
    W - nasal root high, wide distance between lower orbit and nasal root, pronounced spine 

    • A - nasal root low, narrow distance ""
    • spine small

    • B- nasal root low, narrow ""
    • spine absent
  7. Nose
    W
    A
    B
    • W - nasal root narrow, isosceles triangle
    • A -nasal root intermiediate, opening intermiediate
    • B - nasal root wide, opening equilateral triable
  8. bottom of nose

    W
    B
    A
    W - distinct "sill" on ower border of nose

    B - indistinct lower border with "guttering" 

    A - intermiediate between two
  9. Face  - what is the diagnostic feature?
    • profile
    • differences in facial projection due to diferent jaw sizes
  10. facial projection entails?
    W
    A
    B
    tip of nasal bone to the forward projection of upper jaw

    • W-more vertical
    • A- intermiediate
    • B- face projects forward
  11. width of face (cheekbones)

    W
    A
    B
    • W- Face narrow
    • A - Face wide
    • B - Face narrow
  12. eye orbits

    W
    A
    B
    • W- aglular eye orbits
    • A- rectangular eye orbits
    • B - round eye orbits
  13. lower border of eye

    W
    A
    B
    • A - lower boder of eye projects forward
    • B/W - lower border of eye relatively vertical
  14. Shape of brain case - Vault

    brow ridges and muscle attachments
    W
    A
    B
    W- more pronounced
  15. Sutre patterns

    W
    A
    B

    Wormian bones
    • W or B-basic not too complicated
    • A- more wavy and complex (interdigitation)

    Wormian bones more common in asian individuals
  16. Post bregmatic depression (dip on top of skull)

    W
    A
    B
    • B - dip seen in black people
    • W/A - flat - slightly convex

    * unless individuals have their skulls have been artificially deformed. (first nations) not natural
  17. Teeth and Jaws
    White people
    • W - teeth in white skulls have teeth too large for jaws
    • --> causes dental crowding
  18. dental arch

    W
    A
    B
    • W - parabolic
    • A-  rounded
    • B- hyperbolic (u-shaped)
  19. Insicor shape

    W/B
    A
    • W/B - spatulate
    • A - shovel shaped (90% in asian, and native american invdl.)
  20. Post cranial traits

    Femur

    White and asian?
    Black
  21. W/A = femora with anterior curvature
    B = straight femoral shafts
  22. femorial torsion (on the head of the femur)

    Black
    very little femoral torsion in black people (head angles horizontally)

    high degree of femoral torsion in white and asian individuals (head angled vertically)
  23. Problems with metric methods for ancestry assesment?
    • populations have changed since early 20th century
    • methods of measurement unclear
    • --> measuring qualitative measurements as well (not independant)
  24. post cranial measurement


    Femur (direct measurement)
    Can only be seen on an x-ray

    femur 0 angle of intercondylar shelf of distal femus as seen on x-ray

    White >141 degrees <black

    80% accuracy
  25. metric measurements for ancestry determination

    indexes?

    3 main ones in skull?
    consists of two measurement (one divided by another x 100)

    • maxillofronal
    • zygoorbital
    • alpha
  26. Mandible

    WBA
    • white - pointed chin
    • black - blunt chin
    • aisan - rounded chin and vertical acending ramus
  27. hair

    why useful?

    WAB
    preserves well in forensic context.

    • W - straight/ slightly wave, dense on scalp
    • B - naturally curelled grows more slowly,more parallel to scalp
    • A - grows the fastest, coarse, and perpendicular to skulls.
  28. Is skin colour useful?

    why
    no, not in forensic context

    dark skin will bleach white if lying on damp ground

    after death,light skin begins to darken.

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