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Forensic chapter 3 study of hair
Forensic chapter 3 study of hair
Forensic chapter 3 study of hair
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Here for you I have a diagram of the basic parts of hair. I am only going to explain the main parts that are important to analyzing hair data.
Cuticles: Is a transparent outer layer of the hair shaft.
Cortex: the largest part of the hair shaft
Medulla: The center of the hair is called the medulla. Also where the color of your hair is.
Follicle: The sheath of cells and connective tissue that surrounds the root of a hair.
By finding the many traits and characteristics it is important for forensic scientists to look at the hair both macroscopically and microscopically. Macroscopically is things that you can see without any type of equipment. For example, length, color and curliness. Microscopically on the other hand can be a little more tricky,
but also give more information. For example, patterns, pigmentation, and scales that are too tiny to see with the human eye. They also use special lens and lights to really catch the appearance of the hair. They also look at where it is from on the body by looking at cross-sectional shape, how old the hair is, whether the hair is treated by its brittleness, racial differences, and the difference between human and animal hair by the thickness. As I explain the basic information about hair analysis you are probably overwhelmed by all the information, what it all means, and how that applies with hair being just class evidence? Without the follicle that contains cells from the person we can not state that the hair is a specific individual, but can be identified with a group with the same hair type. Now you are probably wondering if you can only base it off class than what is the point? Well here is another diagram.
Other evidence located within the grave consisted of a generic watch, two cigarette butts, a button, a washer and a shell casing. All of these could be analysed for finger prints and DNA. The cigarette butts would also show a serial number indicating the brand (shown in Figure 3), which can be useful if it is found a victim or offender smokes a particular type of cigarette.
Just because a hair is found at the scene doesn’t mean that it belongs to the perpetrator. It is important to take Locard’s Principle into account, “The microscopic debris that cover our bodies are the mute witnesses... of all our movements and all our encounters.” (Robertson, 7.2) When you come into contact with something or someone, there is always a transfer, even if it isn’t noticeable. There are different types of transferring, primary and secondary. Primary transfer is when something transfers from you to another source. When someone comes into contact with that source, there is a chance that your hair or fiber transfers onto the other person. This is secondary transfer. Because humans shed hair frequently, it is easy for hair to go through secondary transfer and end up somewhere that the individual had never been. Hair can remain on a source for a couple hours without being transferred and it does not break down very easily, so this can remain in place for a long time. (Robertson,
This cycle tends to last anywhere from five to seven years and is shorter for hair on the eyebrows, armpits and pubic area. Inside the bulb of each hair is a component called the dermal papilla which controls the hair growth while the matrix of the hair, which contains a large amount of epidermal cells that rapidly divide, is responsible for the length of the hair. Next is the catagen phase which is characterized as a transition period between the anagen and telogen phases. At this time the hair bulbs are pushed out in order to become keratinized and the hair appears short and thick. This phase tends to only last between two and three weeks. During the telogen phase, no new cell division occurs, which means that the length of the hair remains the same. This pause allows the dermal papilla to fill up the matrix with new cells in preparation for the anagen phase to begin again. This phase can last between three and nine months. After this phase, the anagen phase begins again. The telogen phase is periodically followed by shedding, or exogen. This leads to the last phase, the exogen phase. This phase is characterized by the shedding of hair. Each day about one hundred hairs are shed from the average individual’s scalp. The shaft of the hair is shed and the follicle remains. Despite the fat that the exogen phase usually follows the telogen phase, there are exceptions when it does not, resulting in hair follicles needing to go
I have always loved suspenseful whodunit television shows, movies, and books that use forensic science to crack the cases. My favorite television show is The First 48, my favorite movie is The Silence of the Lambs, and my favorite book is The Body Farm. Therefore, I was excited to have the opportunity to take this course and learn even more about the subject of forensics. This essay gives a summary of N. E. Genge’s book, The Forensic Casebook: The Science of Crime Scene Investigation, and includes the things I disliked and liked about the book.
Throughout the semester we have studied the black vernacular tradition and its attributes of competition, group interaction, the in- group, and pattern of call and response and we have learned to take those attributes and apply then to the complex subject of Black Hair. Black Hair is a complex subject not only because so little is known about it but because of the aesthetic, political, and interpersonal context through which Black hair can be studied and interpreted. Hair is honestly in just about every text and it is used to not only add insight to characters identity but to also give context to time. Many of the black vernacular tenets are seen throughout Margo Jefferson’s chapter in Negroland, in particular the first section called “The
The blood of the unknown person became apparent through comparing the blood type found at the crime scene with the contrasting blood types of the suspects. The blood identified at the crime scene could have possibly belonged to Anna Garcia or Erica Piedmont. This observation was based on the information that the blood type found at the crime scene was type A and these two individuals are the only ones that carry that specific type. In similarity, a microscopic photography was taken of the unknown hair follicle found at the crime scene. Then hair samples were taken from the potential suspects, and the victim. These findings were then compared. This was done by looking at each individuals hair follicles and comparing it with the unknown one. By looking at the similarities and differences in medulla diameter, the discovery of the unknown hair follicle became established that it belonged to Anna Garcia. Further examination resulted in the analyzation of a shoe print found at the crime scene. Shoe patterns and sizes were taken from each suspect, including the victims. They were then identified and compared to the one found at the crime scene. By looking at the distinct pattern, size, and the fact that both shoes were a Columbia brand sneaker it became obvious that the shoe print was extremely similar to Anna’s shoe design. Through this found evidence it became
The development of hair, feathers, teeth, and scales all depend on the same structure. What is it called? (2 points) Dermal papilla
In conclusion, the question of how hair texture among an ethnicity is determined has yet to be answered. However, new developments such as the evidence that all humans have the same single origin in Africa and mutations in the P2RY5 gene can determine the hair texture of a human, have shown that researchers are quite close in determining the hair texture of an ethnicity. These developments have the possibility of leading to new hair removal and hair growth treatments. The future looks bright for hair research and hopefully in the next 20-50 years the question is answered.
These hairs may be of evidentiary value to show contact between two people. With an adequate hair standard, a trace chemist will be able to microscopically compare an unknown hair to a standard collection and determine if the unknown hair could have come from the individual under investigation. Hair comparisons can not identify hair as coming from one individual to the exclusion of anyone else. DNA testing can strengthen any possible association with the hairs." - Locard.... ... middle of paper ... ...
Forensic Science, recognized as Forensics, is the solicitation of science to law to understand evidences for crime investigation. Forensic scientists are investigators that collect evidences at the crime scene and analyse it uses technology to reveal scientific evidence in a range of fields. Physical evidence are included things that can be seen, whether with the naked eye or through the use of magnification or other analytical tools. Some of this evidence is categorized as impression evidence2.In this report I’ll determine the areas of forensic science that are relevant to particular investigation and setting out in what method the forensic science procedures I have recognized that would be useful for the particular crime scene.
Linch CA, Prahlow JA, conducted a study on 2001 , Post-mortem Microscopic Changes Observed at the Human Head Hair Proximal End, in Dallas County Institute of Forensic Sciences, in the 22 postmortem cases. Cases were selected where an approximate time of death was known or could be determined from reviewing medical investigator reports. Hair proximal ends were photographed with a Zeiss compound microscope and observed. And he concluded that postmortem hair proximal end morphologic changes appear to be relatively specific for the decomposition process, but the timing of their appearance is not helpful in determining post-mortem
is an unescapeable part of your life. Where your hair can not always be neat
the ovary. A style, which is usually stalklike, rises from the ovary. The tip of
In the early stages, you’ll notice bald spots on the scalp. Rarely, in one to two percent of cases, the entire scalp is affected (alopecia totalis), or the entire epidermis (alopecia universalis).
Before genetic technology was introduced into forensics , which was in the 1900s, whatever evidence was left behind from a crime the evidence could barely be used. If a speck of blood was left behind the most a forensic scientist could tell was the blood type of a person which many people could have the same blood type. Also hair was big in the late 1800s. There were forensic scientists whose only job was to look at hair evidence