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52 Cards in this Set
- Front
- Back
human hair
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One of the most frequently found pieces of evidence at the scene of a violent crime
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3
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The average human replaces their head hair in a cycle of this many years
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class
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Without follicle cells attached, it is not possible to show with any certainty that two hairs came from the same person or animal, therefore it is considered what type of evidence?
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tape lift
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This method is used to collect hair evidence when there are many hairs in a small area
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vacuum
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This method is used to collect hair evidence when there are many hairs in a large area
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insulate
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The main purpose of hair is to regulate body temperature by doing this
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fur
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In many mammals, hair can be very dense, and it is then referred to as this
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cortex
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The middle layer of the hair shaft that provides strength and contains granules of color pigment
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cortical fusi
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Irregularly shaped air spaces in the cortex of hair
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cuticle
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The tough, clear, outer covering of hair composed of overlapping scales
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follicle
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The actively growing root or base of a hair
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keratin
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Protein that makes hair strong and flexible
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medulla
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Spongy core of a hair fiber that gives it flexibility
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metabolite
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A specific product of a substance, formed by chemical processes in the body
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class
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Hair is considered this kind of evidence
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secondary transfer
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When hair is moved from the source, to one item, to another item
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animal
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Secondary transfer is common with what type of hair evidence?
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paper bindle
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Package used to hold hair evidence
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papilla
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A network of blood vessels that supply nutrients to hair and help it grow
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sebaceous
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Gland in skin to secrete oil
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erector
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Muscles in skin that cause hair to stand upright
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shaft
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Region of hair composed of the cuticle, cortex and medulla
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eumelanin
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Pigment granules which give color to brown and black hair
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pheomelanin
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Pigment granules which give color to blonde and red hair
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continuous
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A medulla pattern that consists of an unbroken line of color
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interrupted
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A medulla pattern that consists of a pigmented line broken at regular intervals
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fragmented
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A medulla pattern that consists of a pigmented line that is both broken and unevenly spaced
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exclusion
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Term used when it has been determined that hairs do not have a common origin
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fifty
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Number of hairs collected from a suspect's head for comparison
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anagen
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Stage of active hair growth; Approx. 85% of all human hair is in this stage
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catagen
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Transitional stage where hair growth slows; accounts for about 2% of all hair growth and development
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telogen
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Final stage of the hair cycle in which hairs fall out; about 12% of all hairs are in this stage which lasts a few months
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distal
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Tips of hair that can give clues to treatments or last hair cut
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razor
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Hairs cut with this tool have a long tail on one side of the cut
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clippers
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Hairs cut with this tool have broken and partially cut shafts
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bleaching
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Hairs that have had this treatment have a yellowish tint and are brittle
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medullary index
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Equation helpful to distinguish between a human and other animal hair
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animal
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If the medullary index is 0.5 or greater, the hair came from this source
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human
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If the medullary index is 0.33 or less, the hair came from this source
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coronal
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Type of scales that resemble a stack of paper cups; commonly found in the fur hairs of small rodents and bats
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imbricate
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Type for overlapping scales with narrow margins; commonly found in human hair
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spinous
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Type of triangular, protruding scales; commonly found in the fur hairs of mink, seals, and cats
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electron
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A type of microscope that magnifies a specimen 50,000 times or more; provides incredible detail of the surface or interior of evidence
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fluorescence
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A type of microscope equipped with filters to detect shined light, indicating the presence of a dye or other treatment
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comparison
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A microscope that allows the side-by-side comparison of hair samples
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follicular tag
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When hair is forcibly removed, this is often attached at the base
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individual
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When hair has DNA in the follicle, it is considered this type of evidence
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six
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Forensic scientists distinguish this many types of hair on the human body (be able to name them all)
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head, pubic
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The two most common types of hair found at crime scenes
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dissolved
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In order to test hair for drugs and other chemicals, what first needs to be done to it?
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neutron activation analysis
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This technique can identify up to 14 different elements in a single two centimeter-long strand of hair
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coin envelope
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Package that can be used to hold hair evidence when a paper bindle is not available
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