Definitions for hair follicle
ha·ir fol·li·cle

Princeton's WordNetRate this definition:0.0 / 0 votes

1. hair folliclenoun

   a small tubular cavity containing the root of a hair; small muscles and sebaceous glands are associated with them

WikipediaRate this definition:0.0 / 0 votes

1. Hair follicle

   The hair follicle is an organ found in mammalian skin. It resides in the dermal layer of the skin and is made up of 20 different cell types, each with distinct functions. The hair follicle regulates hair growth via a complex interaction between hormones, neuropeptides, and immune cells. This complex interaction induces the hair follicle to produce different types of hair as seen on different parts of the body. For example, terminal hairs grow on the scalp and lanugo hairs are seen covering the bodies of fetuses in the uterus and in some newborn babies. The process of hair growth occurs in distinct sequential stages. The first stage is called anagen and is the active growth phase, telogen is the resting stage, catagen is the regression of the hair follicle phase, exogen is the active shedding of hair phase and lastly kenogen is the phase between the empty hair follicle and the growth of new hair.The function of hair in humans has long been a subject of interest and continues to be an important topic in society, developmental biology and medicine. Of all mammals, humans have the longest growth phase of scalp hair compared to hair growth on other parts of the body. For centuries, humans have ascribed esthetics to scalp hair styling and dressing and it is often used to communicate social or cultural norms in societies. In addition to its role in defining human appearance, scalp hair also provides protection from UV sun rays and is an insulator against extremes of hot and cold temperatures. Differences in the shape of the scalp hair follicle determine the observed ethnic differences in scalp hair appearance, length and texture. There are many human diseases in which abnormalities in hair appearance, texture or growth are early signs of local disease of the hair follicle or systemic illness. Well known diseases of the hair follicle include alopecia or hair loss, hirsutism or excess hair growth and lupus erythematosus.

ChatGPTRate this definition:0.0 / 0 votes

1. hair follicle

   A hair follicle is a tiny tubular cavity or sac in the skin from which hair grows. It is part of the skin's integumentary system, and contains the hair root and necessary cells and proteins for hair growth. It is also associated with sebaceous glands and often, a tiny muscle called the arrector pili. Hair follicles can be found all over the body, except on the palms of the hands and the soles of the feet.

WikidataRate this definition:0.0 / 0 votes

1. Hair follicle

   A hair follicle is a mammalian skin organ that produces hair. Hair production occurs in phases, including growth, cessation, and rest phases. Stem cells are responsible for hair production.

U.S. National Library of MedicineRate this definition:0.0 / 0 votes

1. Hair Follicle

   A tube-like invagination of the EPIDERMIS from which the hair shaft develops and into which SEBACEOUS GLANDS open. The hair follicle is lined by a cellular inner and outer root sheath of epidermal origin and is invested with a fibrous sheath derived from the dermis. (Stedman, 26th ed) Follicles of very long hairs extend into the subcutaneous layer of tissue under the SKIN.

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1. • Follicle

How to pronounce hair follicle?

1. Alex

   US English

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   British

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   Australian

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How to say hair follicle in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of hair follicle in Chaldean Numerology is: 6

2. Pythagorean Numerology

   The numerical value of hair follicle in Pythagorean Numerology is: 2

Examples of hair follicle in a Sentence

1. Sekyu Choi:

   Under both normal and stress conditions, adding Gas6 was sufficient to activate hair follicle stem cells that were in the resting phase and to promote hair growth, in the future, the Gas6 pathway could be exploited for its potential in activating stem cells to promote hair growth. It will also be very interesting to explore if other stress-related tissue changes are related to the stress hormone’s impact on regulating Gas6.

2. Sekyu Choi:

   We first asked whether the stress hormone was regulating the stem cells directly and checked by taking out the receptor for corticosterone, but this turned out to be wrong. Instead, we found that the stress hormone actually acts on a cluster of dermal cells underneath the hair follicle, known as the dermal papilla, dermal papilla is known to be critical for activating hair follicle stem cells, but none of the previously identified factors secreted from dermal papilla changed when stress hormone levels were altered. Rather, the stress hormone prevented dermal papilla cells from secreting Gas6, a molecule that the researchers showed can activate the hair follicle stem cells.

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=hair follicle
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Hair_Follicle
3. ^ ChatGPT
   https://chat.openai.com
4. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=hair follicle