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Mar 17, 2024 · The hair shaft is the visible, nongrowing portion of a hair protruding from the skin. This part of the hair is not anchored to the hair follicle. a central medulla, a keratinised cortex and an outer layer, known as the cuticle, which is highly keratinised and forms the thin hard cuticle on the outside of the hair.
- Medical Content
- 29 min
- Fashion Statement
- What Is hair?
- Structure of Hair
- Characteristics of Hair
- Functions of Hair
- Hair in Human Evolution
- Social and Cultural Significance of Hair
This colourful hairstyle makes quite a fashion statement. Many people spend a lot of time and money on their hair, even if they don’t have an exceptional hairstyle like this one. Besides its display value, hair actually has important physiological functions.
is a filament that grows from a in the of the skin. It consists mainly of tightly packed, keratin-filled cells called . The human body is covered with hair follicles, with the exception of a few areas, including the mucous membranes, lips, palms of the hands, and soles of the feet.
The part of the hair located within the follicle is called the .The root is the only living part of the hair. The part of the hair that is visible above the surface of the skin is the hair shaft. The shaft of the hair has no biochemical activity and is considered dead.
Two visible characteristics of hair are its colour and texture. In adult males, the extent of balding is another visible characteristic. All three characteristics are genetically controlled.
In humans, one function of head hair is to provide insulation and help the head retain heat. Head hair also protects the skin on the head from damage by . The function of hair in other locations on the body is debated. One idea is that body hair helps keep us warm in cold weather. When the body is too cold, muscles contract and cause hairs to stand...
Among mammals, humans are nearly unique in having undergone significant loss of body hair during their evolution. Humans are also unlike most other mammals in having curly hair as one variation in hair texture. Even non-human primates (see Figure 10.5.7) all have straight hair. This suggests that curly hair evolved at some point during human evolut...
Hair has great social significance for human beings. Body hair is an indicator of biological sex, because hair distribution is . Adult males are generally hairier than adult females, and facial hair in particular is a notable secondary male sex characteristic. Hair may also be an indicator of age. White hair is a sign of older age in both males and...
- Christine Miller
- 2020
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May 28, 2023 · Hair shaft. The non-growing portion of a hair which protrudes from the skin, i.e., from the follicle. Synonym: scapus pili. Last updated on May 28th, 2023.
A hair shaft consists of dead, keratin-filled cells that overlap each other like the shingles on a roof (see Figure below ). Like roof shingles, the overlapping cells help shed water from the hair. Shaft of Human Hair. This shaft of hair is magnified to show its overlapping cells. Hair helps to insulate and protect the body.
Introduction. Hair is composed of terminally differentiated, dead keratinocytes (trichocytes), which are compacted into a fibre of amazing tensile strength, the hair shaft. The presence of hair is characteristic for mammals, in which it exerts a wide range of tasks.
- Marlon R. Schneider, Ruth Schmidt-Ullrich, Ralf Paus, Ralf Paus
- 2009
Sep 7, 2023 · These include the hair bulb, the hair papilla, and the sebaceous gland. The intricate structure of the hair shaft is essential for the overall health and efficiency of the hair. The different layers of the hair shaft work together to protect, strengthen, and insulate the hair. Its principal purpose is to protect the inner cortex and is made up ...
The hair shaft is the part of the hair not anchored to the follicle, and much of this is exposed at the skin’s surface. The rest of the hair, which is anchored in the follicle, lies below the surface of the skin and is referred to as the hair root .
