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Forensic Anthropology. Forensic Anthropology. Definition: An applied area of physical anthropology Role: To assist law enforcement agencies in a medico legal context. General Goals. 1. Establish biological profile: age, sex, race, height 2. Determine time since death - PowerPoint PPT Presentation
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Forensic Anthropology
Forensic Anthropology• Definition: An applied area of
physical anthropology
• Role: To assist law enforcement agencies in a medico legal context
General Goals• 1. Establish biological profile: age,
sex, race, height• 2. Determine time since death
– (PMI- post mortem interval)
• 3. Examine remains for signs of trauma• 4. Establish positive identity
Who do they work with?• Police Departments• Sheriff’s Offices• Office of the Attorney General• Coroner’s offices• FBI• ATF• Private individuals
Estimating Age• Skull features
• Dentition
• Epiphysial fusion of long bones
Skull Features…• The cranium (the skull minus the
lower jaw bone, or mandible)
• consists of 28 bones. (6 unpaired bone, and 8 paired bones, plus 3 ear bones on each side)
• Some bones are paired, which means there is a left and right one, and some bones are unpaired, meaning there is just one.
• Neonate – Newborn = first 28 days after birth• The mandible is more commonly known as the lower jaw bone. • It is the strongest bone of the face • The mandible is two separate bones (left and right) that fuse together to
form one bone.
DENTITION• Teeth can be divided into maxillary (upper) and
mandibular (lower)
• There are four different categories of teeth: incisors, canines, premolars, and molars.
• Adults will usually have a total of 32 teeth.
• The function of each tooth is different. Incisors are designed for cutting, canines are pointed for tearing, and premolars and molars are designed for grinding and reducing food.
The Hyoid• Small, horn-shaped bone that supports the
tongue, and gives attachment to many muscles in speech.
• This bone is of particular interest to forensic anthropologists as it is commonly broken in cases of strangulation.
• Unfused hyphoid. This fuses at about 35 years of age.
Long Bones• Humerus - your upper arm
bone
• Ulna/Radius - your lower arm bones
• Femur – your thigh bone. It is the largest of all bones
• Tibia & Fibula - two bones that make up your lower leg– tibia is known as the shin bone,
and it is the second largest bone in the body
Radius & UlnaHumerus
FEMUR Fibula & Tibia
Determining Sex
• Skull features• Pelvic Bone Characteristics
• Analysis of Femur
• Dentition
A baby's skeleton has 350 bones, but many of these fuse to give an adult a total of 206 bones. A man's skeleton has broader shoulders than a woman's, a longer ribcage, and a pelvic girdle for walking/running. A woman's skeleton has the same bone complement as a man's but is slightly smaller and less robust, with a wider pelvic opening to assist childbirth.
Skull Features
FEATURE MEN WOMEN
Cranial Mass Blocky & MassiveDeeper
Rounder & Tapers at the Top
Brow Ridge Margin is rounder & dull Margin is sharper
Zygomatic Bone More Pronounced Less Pronounced
Mandible (lower jaw)
Square Shaped Rounded Shape
Supercilary Arch More Pronounced & larger
Less Pronounced & smaller
Pelvic Bone Characteristics• The innominate bones
are irregular in shape– AKA: Hip Bone– the large bone in the hip,
consisting of the ilium, the ischium, and the pubic bone.
• They are the best means of determining the SEX of a skeleton
FEMALE MALE
Analysis of the Femur
• Typically longer in men
• Women’s bones stop developing around 18
• Men’s bones develop until about 21
• Men have more bone mass
Determining Race• Caucasoid characteristics: Oval eye orbits, Narrow
nasal opening
• Negroid characteristics: square eye orbit, greater breadth at nose, protruding teeth
• Mongoloid: in between the two. Native Americans have “shoveled” teeth.
RACE IS THE HARDEST TO IDENTIFY
Caucasoid
American Negroid
Native American
Determining Time Since Death• Decay of epidermis
and/or skeleton• Articulation & scattering of remains
• Material Remains??•Clothing•Objects
Postmortem Interval - PMI• Antemortem trauma: Before death• Perimortem trauma: at or around the
time of death• Post mortem trauma: after death
Femur with animal chew marks on either end
Cause of Death• Can be homicide, suicide, accidental, natural, and unknown
• Easier with a fleshed body and often very difficult with flesh and organs gone
• Look for things like depressions and indentations caused by blunt trauma, lead fragments, etc.