Forensic Anthropology: Studying Bones
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1 Forensic Anthropology: Studying Bones There is a brief but very informative biography of an individual contained within the skeleton, if you know how to read it Clyde Snow, Forensic Anthropologist
2 Characteristics of Bones Cartilage before Bone Cells called osteoblasts deposit minerals into center of cartilage and harden it Bones are constantly produced and broken down Growing and Changing Babies have 450 bones & adults have 206 bones (they fuse) Bones get longer and thicker with age and use When cartilage growth plate fuses = no more growth
3 What We Learn from Bones Human or animal? Determination of Sex Pelvis Skull Determination of Race Skull Approximate Age Teeth Cranial Sutures Epiphyseal (growth plate) fusion Approximate Height Length of long bones Injuries (Postmortem or antimortem)
4 Determination of Sex: Pelvis (differences in childbirth adaptations) 2. 2.
5 Sex Determination- Pelvis (another view) 1. females have wider subpubic angle 2. females have a flexible pubic symphysis 2.
6 Determination of Sex: Skull Male Female -more pronounced ridges & crests -Forehead sloped -Squared chins
7 Male Skull
8 Female Skull
9 Determination of Age from Bones Most accurate estimations from: Teeth Epiphyses (growth plates) fusion Cranial sutures: 3 pieces when young Investigators use age range b/c people vary in how they age - Adults yrs are very hard to determine - Ages 40+: basically wear and tear on bones
10 Age Determination: Use of Teeth Teeth waiting to come in Permanent
11 Growth Plates- fuse at predictable time frames Where new bone forms
12 Epiphyseal (growth) Plates Fusion: A General Guide
13 Age Determination Using Cranial Sutures ** not very accurate When you are born, skull is in several pieces that fuse together (soft spots) as you age. Lamboidal suture closed by 30 yrs (starts closing around 21 yrs) Sagittal suture closed by 35 yrs Coronal suture closed by 50 yrs
14 Other Information We Can Get From Bones: Evidence of trauma (here GSW to the head) Evidence of post mortem trauma (here the head of the femur was chewed off by a carnivore)
15 Estimation of Height using Long Bones (usually +/- 3.5 cm) Use equations below to estimate height (in cm) Bone Race Male Equation Female Equation Caucasian 2.32 x Length cm 2.47 x Length cm Femur African-American 2.10 x Length cm 2.28 x Length cm Asian 2.15 x Length cm 2.38 x Length cm Caucasian 2.89 x Length cm 3.36 x Length cm Humerus African-American 2.88 x Length cm 3.08 x Length cm Asian 2.68 x Length cm 3.22 x Length cm
16 Height Estimation Example Asian female femur found measuring 45.5 cm. What's her estimated height in inches? (1 inch = 2.54 cm )
17 Height Estimation Example Asian female femur found measuring 45.5 cm. Formula: 2.38 * Length cm Plug in:2.38 (45.5) cm = ~ cm (1 inch = 2.54 cm ) 165 cm/ 2.54 cm = 65 inches = ~ 5 ft 4 in
18 Facial Restoration After determining the sex, age, and race of an individual, facial features can be built upon a skull to assist in identification. Erasers are used to make tissue depths at various points on the skull. Clay is used to build around these markers and facial features are molded. Read about the John List story
19 Animal Facial Restoration Determining what T Rex looked like using the bone formation. From this: To this:
20 Anthropologist at Work This anthropologist is hard at work dusting away material from these imbedded bones. Picture taken at Chicago s Museum of Natural History
21 Forensic experts may be called upon to give information on the life & death of humans and animals in unique circumstances, including: More Applications Mass Murder (Oklahoma bombing, plane crashes, World Trade) Earlier man (mummies, Iceman, Lindow man) Historical Significance (Holocaust, uncertain death of famous people) Prehistoric Animals (Dinosaurs)
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