What is hair?
Hair is the fine, threadlike structure growing from the skin of both animals and humans. The primary structure of the hair is known as the shaft and mostly composed of keratin, a fibrous protein (Douglas, 2000). The hair follicle anchors the hair to the skin which forms an enlargement, or hair bulb (WebMD, 2014). Within the hair bulb living cells grow to build the hair shaft. The hair shaft consists of three distinct layers (Hughes, 2013):
• medulla
• cortex
• cuticle
The medulla is the innermost layer with a soft construction, the cortex, the layer which contains the pigment, or color of the hair, and provides the elasticity, and lastly, the cuticle which is the outermost layer with a flaky appearance. The cuticle is hard and protects the cortex and the medulla from damage. More commonly than not, hair is attributed to DNA, however it cannot be found within those three layers mentioned. The hair root is embedded below the scalp and is surrounded in a hair follicle (Hughes, 2013). The hair follicle is linked to the blood stream via the dermal papilla and contains DNA, which can be tested and used as evidence in an investigation.
Each strand of hair possesses a variety of characteristics which include: length, color, shape, root appearance, and microscopic characteristics which can identify its origin on the body. Hair can be found on many different regions of the body which include the head, pubic region, legs, arms, chest, and axillae (armpit), amongst
Human hair is available in many different grades; mainly from women that offer their hair to deities in Hindu temples and other countries in a show of respect and gratitude. Few don’t realize the offerings wind up in a lucrative export market serving China and Hollywood and all over the world. Human Hair texture wigs need special care to last longer than one year, as they can become delicate and brittle. This type of wig is usually more expensive because of the natural look and softer feel it originates. Using suitable hair products to keep the wig moisturized and protected can lengthen the lifetime for the wig. Human hair wigs is a more indistinguishable alternative to natural hair. They are easier to care
1. The clear, keratinized portion of a fingernail is known as the nail _PLATE_. It has a root, body, and free edge.
The skin is divided into three different parts including the epidermis, dermis, and hypodermis. The epidermis is the outermost layer of the skin. This region of the skin has no blood cells or blood vessels running through it. All of the nutrients that the epidermis needs are received through diffusion from the dermis. The epidermis is made up of stratified squamous epithelial cells. The epidermis is made of five separate layers: the stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, and the stratum corneum. Starting at the innermost layer, the stratum basale is where mitosis of keratinocytes takes place. This layer of the epidermis also contains melanocytes which give the skin it’s pigment. As mitosis takes place in the stratum
Hair: composed of columns of dead, keratinized cells bound together by extracellular proteins. Hair has two main sections: The shaft- superficial portion that extends out of the skin and the root- portion that penetrates into the dermis. Surrounding the root of the hair is the hair follicle. At the base of the hair follicle is an onion-shaped structure called the bulb Papilla of the hair and the matrix within the bulb
The three layers that make up healthy skin: Epidermis, Dermis and Hypodermis. Epidermis is composed of keratinized, stratified squamous epithelium. This layer provides a thick, water proof protective covering over the underlying skins. The dermis layer is composed of primarily of dense, irregular, fibrous connective tissue that is rich in collagen and elastin. The dermis contains blood vessels, nerve ending, and epidermally derived cutaneous oranges such as sweat glands, sebaceous glands and hair follicles. The last layer is Hypodermis this layer is composed primarily of loose dead skin. The fat layer provides cushioning and insulation for
Skin is the largest organ on the body. It has two layers: the thin outer layer is made up of dead skin cells that are constantly shed and replaced by new cells. The thick inner layer is made up of blood vessels, nerves, and hair follicles, which contain glands. The glands in the hair follicles produce an oily substance called sebum, which keeps the skin and hair from drying out. Daily washing will keep the skin on the face and other areas of the body clean by removing the dirt, oil, and dead cells before they can accumulate.
The skin secretes sebum from the sebaceous glands. The fatty substance lubricates the hair shafts and when combined with perspiration on the surface of the skin. Treats a natural moisturizer, which acts a protective barrier against bacteria.
Times in the hair replacement industry have changed. Thanks to a better understanding of how hair grows, plus advanced construction materials, what used to be called a "hairpiece" is now referred to as a
The dermis, beneath the epidermis, contains tough connective tissue, hair follicles, and sweat glands. The deeper subcutaneous tissue (hypodermis) is made of fat and connective tissue.
There are factors that are difficult to determine with hair analysis. Such factors include gender, age or race. When conducting an autopsy, a person’s body the bone tells a story about that individual. For example, by examining a person’s bones you can determine whether or not a person is a man or a woman and for about how long that person has lived. However, the hair does not. This may seem counterintuitive, but much can be learned about the human hair. Nationality on the other hand can easily be determined from hair analysis. One such example of a person’s race is that of a Caucasoid or European, Mongoloid or Asian, and Negroid or African follicles are all very distinct in texture and can be linked to that particular nationality. The analysis of hair is general in nature and limited to those three nationalities.
A persons hair contains their DNA. Also there are several different parts of a persons piece of hair. Some different parts of hair are the root, cuticle, cortex, shaft, and medulla. I know you all are probably wondering what exactly are these different parts of the hair. Well the root is the part of the hair that’s
Fact 1: Biology - The skin The skin is the outer most layer of most animals and is seen as the largest organ of the body consisting of 3 layers, namely the epidermis, dermis and sub-dermis or hypodermis. These layers contain different specialized structures, as can be seen on the diagram on the cover page, which perform functions that are essential for our survival. The skin separates the internal body from the surrounding environment and thus it protects the body against water loss, radiation, toxic chemicals and infections in the surrounding environment. One of the structures that is further discussed are melanocytes in the epidermis and melanin production.
Stratum Corneum this layer is the outer most layers; it is formed from numerous layers of compressed scale- like, overlapping cells. What makes up the surface of the skin is corneocytes, which are commonly called ‘dead skin cells’. Keratinocytes are found in the epidermis they travel up through the layer where they are formed into corneocytes. The stratum corneum layer protects against lights, chemicals, water loss, heat and bacteria.
The skin is one of the most important organs of the body because it protects the body from outer dangers, like, bacteria that can cause infections. There are many structures that compose the skin, such as, the epidermis layer is the first layer of the skin that is made of keratinized stratified squamous epithelial cells and has no blood supply, and therefore it gets its nutrients through diffusion. This layer has many layers before it reaches the second layer of the skin. The deepest layer is called the stratum basale, this layer has a row of stem cells that are the most mitotic and nourished out of all the layers of the epidermis. When the mitotic basal cells divide, one of the keratinocytes daughter cells continue into the second deepest layer of
Irrespective of the type of hair you are born with, follow these 5 tips and see the results yourself: healthy and luxurious hair.