Chapter 14 Human Remains Forensic Anthropology Identifies skeletal
- Slides: 50
Chapter 14 Human Remains
Forensic Anthropology Identifies skeletal Remains where bones are the only evidence
Responsibilities Assist in investigation of crimes
Examine and analyze human remains
Skills used to… Recover individuals from crime scene
Reconstruct remains to analyze effects of trauma
Identify human remains …when conventional methods cannot be used
Give expert testimony
Remains human? Single individual or several? When did death occur? Was the body disturbed post-mortem? Gender, race, age? Cause of death? Type of death? Signs of disease, old injuries? Height, weight, physique estimated?
Functions of the Skeleton: Internal structure and support Protection of vital organs Attachment for muscles Make blood cells Storage of minerals
Types of bones: Long Short Flat Irregular
1. Determining time of death ***Most accurate if body is found within 24 hours of death A. Algor mortis; cooling of the body after death Body cools at approx. 1 -1. 5 degrees per hour until environmental temp is reached. Glaister formula gives hours elapsed: 98. 4 – internal temp ________ 1. 5 Researcher must consider factors such as… Environmental temp. Type of clothing Is clothing wet? (aids cooling) Air movement (aids cooling) Layers of clothing (prevents cooling) Surface area/body mass ratio (small bodies will cool more quickly)
B. Livor mortis; purple or red discoloration of the skin after death, caused by pooling of the blood due to gravity. Begins. 5 hr after death, most evident within 12 hr. After 12 hr discoloration will not move regardless of how the body is handled or moved. Areas in contact with ground (or anything) show no discoloration because capillaries are compressed. C. Rigor mortis; stiffness in skeletal muscles 2 -3 hrs after death, lasting until ~30 hrs. Smaller muscles first. Affected by temp, dehydration, condition of muscles, use prior to death, etc.
2. Animal vs Human Bone Osteology; the study of bones Osteons;
In animals, these osteons would occur in rows (osteon banding) or rectagular shapes (plexiform bone). Sheep tibia
3. Estimating Height …using long bones. humerus radius femur tibia
Since men and women have different proportions of long bone length to total body height, we have a different formula for each sex… Height (cm)= femur x 2. 21 + 61. 41 femur x 2. 23 +69. 08 tibia x 2. 53 + 72. 57 tibia x 2. 39 + 81. 68 humerus x 3. 14 + 64. 97 humerus x 2. 97 + 73. 57 radius x 3. 87 + 73. 50 radius x 3. 65 + 80. 40
4. Sex Determination Using the pelvis
These three bones fuse together to make the os coxa, or half of the pelvis.
Also, the ventral arc and the width of the pubic body Pg. 418 in text
…using the skull
Use page 421 to add other features
5. Age Determination Epiphyses; growth plates at the end of long bones that fuse to the bone during early adulthood. (pg 423 of text)
Using cranial sutures
Sagittal Suture closed: or older 26 or older Sagittal Suture completely open: Younger than 32 29 Younger than 35
Using the os pubis Furrows (youngest) Breakdown of bone Smooth
6. Determining Race 1. Caucasoid; European, Middle Eastern, East Indian de 2. Negroid; African, Aboriginal, Melanesian descent 3. Mongoloid; Asian, Native American, Polynesian desce
History of Forensic Anthropology A. B. End of 19 th century Dr. Thomas Dwight “Father of American (1843 -1911) Forensic Anthropology”
Dr. Thomas Dwight. . Looked at clues to ID a person from bones
Other leading forensic anthropologists Dr. George Dorsey 1868 -1931 National Museum of Natural History, Smithsonian Institution. LUETGERT CASE
Dr. T. D. Stewart Curator from the Smithsonian Institute Helped ID casualties from WWII and the Korean War
CILHI Central Identification Laboratory in Hawaii
1. Responsibility Identify and repatriate American soldiers
2. How remains are analyzed. . Teams travel to field locations
Statistical methods are used To differentiate remains from those of the native population
The remains are taken to CILHI Where a biological profile is created and compared to a database
Multidisciplinary approach TEAM APPROACH
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