Did you know hair grows about 1cm per month?
Hairs which are composed primarily of the protein keratin. They are defined as slender outgrowth of the skin of mammals. A microscope can tell weather it is animal or human hair. Human hairs found on the head, pubic region, arms, legs, and other body areas have characteristics that can determine there origin. Three layers of the hair shaft are used in determining how a crime was committed and who the criminal may be. The medulla, the innermost core of the hair, can he used to determine the race of ethnicity of the potential perpetrator. The cortex is the layer of the medulla and is used to compare one hair to another. Microscopic air bubbles and pigment granules help scientists distinguish between the hair types. The outermost layer, the cuticle, can be used to determine the species through analysis of the patterns of scales that cover the cortex. Hair is composed of the protein keratin, which is also the primary component of finger and toe nails. The hair shape could be round or oval and the texture could be curly or straight. While investigating the root of the hair can be one of the most useful pieces of evidence. The root can tell if the hair was shed naturally, pulled out, or cut off. The root is where investigators can find DNA.
Hairs which are composed primarily of the protein keratin. They are defined as slender outgrowth of the skin of mammals. A microscope can tell weather it is animal or human hair. Human hairs found on the head, pubic region, arms, legs, and other body areas have characteristics that can determine there origin. Three layers of the hair shaft are used in determining how a crime was committed and who the criminal may be. The medulla, the innermost core of the hair, can he used to determine the race of ethnicity of the potential perpetrator. The cortex is the layer of the medulla and is used to compare one hair to another. Microscopic air bubbles and pigment granules help scientists distinguish between the hair types. The outermost layer, the cuticle, can be used to determine the species through analysis of the patterns of scales that cover the cortex. Hair is composed of the protein keratin, which is also the primary component of finger and toe nails. The hair shape could be round or oval and the texture could be curly or straight. While investigating the root of the hair can be one of the most useful pieces of evidence. The root can tell if the hair was shed naturally, pulled out, or cut off. The root is where investigators can find DNA.
achesonindustries.com
The shaft is composed of three different layers, the cuticle the cortex and the medulla. Hair's main purpose is to regulate body temperature and to keep the body warm by insulating it. It also decreases friction, to help protect against sunlight. In many mammals there hair is very dense and is referred to as fur. With human body hair it does not play a big part in regulating body temperature. When humans are born they have about 5 million hair follicles, but only 2% of them are on your head. As a human ages the density of their hair decreases.
thegoodhairblog.blogspot.com
There are 5 different types of medulla:
- Continuous: One unbroken line of color
- Interrupted (Intermittent): Pigmented line broken at regular intervals
- Fragmented or Segmented: Pigmented line unevenly spaced
- Solid: Pigmented area filling both the medulla and the cortex
- None: No separate pigmentation in the medulla
asmed.com.tr
Terminal hair is hair on the body grown my hormones. But Vellus hair is not grown by hormones and is like peach fuzz.
Dog and human hair's are different because the texture of hair can be coarse as it is in whiskers on an animal or fine as it is in a younger child. Some furs are a mixture as in dog coats, which often have two layers: one fine and one coarse. Human hair and animal hair have some differences like the pattern of pigmentation, the medullary index, and the cuticle type. The pigmentation in human hair tends to be denser toward the cuticle, and in animals it is denser toward the medulla. Animal pigments are found in solid masses called ovoid bodies, this especially happens with dogs and cattle. Human are most likely one color along the length, but animal hairs can change color abruptly in a banded pattern. In animal hair the medulla is larger than it is in human hair. If the medullary index is 0.5 or greater, the hair came from an animal, but if the medullary indes is 0.33 or less, the hair came from a human.