Hair Growth Cycle
Hair Growth Cycle - Related Videos
01:20
Accessory Structures of the Skin: Hair Growth and Types
0 Views •
2023
Hair growth begins with the production of keratinocytes by the basal cells of the hair bulb. As new cells are deposited at the hair bulb, the hair shaft is pushed through the follicle toward the surface. Keratinization is completed as the cells are pushed to the skin surface to form the shaft of hair that is externally visible. The external hair is completely dead and composed entirely of keratin. Hair can be cut or shaven without damaging the hair structure because the cut is superficial. Most...
01:22
Hair Cells
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2019
Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here. Hair cells are named after...
08:54
Validated LC-MS/MS Panel for Quantifying 11 Drug-Resistant TB Medications in Small Hair Samples
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Cited by 5 •
2020
Current methods of analyzing patients’ adherence to complex drug resistant-tuberculosis (DR-TB) regimens can be inaccurate and resource-intensive. Our method analyzes hair, an easily collected and stored matrix, for concentrations of 11 DR-TB medications. Using LC-MS/MS, we can determine sub-nanogram drug levels that can be utilized to better understand drug adherence.
05:28
Targeted Expression of GFP in the Hair Follicle Using Ex Vivo Viral Transduction
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Cited by 1 •
2008
The hair follicle is a highly complex appendage of the skin containing a multiplicity of cell types. The follicle undergoes constant cycling through the life of the organism including growth and resorption with growth dependent on specific stem cells. The targeting of the follicle by genes and stem cells to change its properties, in particular, the nature of the hair shaft is, discussed. Hair follicle delivery systems are described, such as liposomes and viral vectors for gene therapy. The...
09:23
Imaging the Root Hair Morphology of Arabidopsis Seedlings in a Two-layer Microfluidic Platform
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Cited by 11 •
2017
This article demonstrates how to culture Arabidopsis thaliana seedlings in a two-layer microfluidic platform that confines the main root and root hairs to a single optical plane. This platform can be used for real-time optical imaging of fine root morphology as well as for high-resolution imaging by other means.
FAQs
Anagen supports active hair-shaft production because follicle matrix cells divide and generate the shaft during this phase. The strength of this activity helps explain why anagen is the cycle’s principal growth period. Examining matrix-cell behavior therefore gives biology researchers a direct way to connect follicle activity with visible hair production.
Catagen and telogen contribute different kinds of change after active production. Catagen is the brief transition in which the follicle regresses, whereas telogen is the resting period that precedes shedding and renewed growth. Distinguishing these phases helps researchers determine whether an observed change reflects follicle regression, temporary rest, or the return to production.
Together, hormonal, genetic, and local cellular signals influence both the timing and duration of cycle phases. Changes in these controls can therefore modify how long follicles remain in growth, transition, or rest. Studying the signals helps explain why hair-growth patterns vary and provides a biological basis for investigating hair-loss conditions.
Tracking the phases provides a framework for comparing normal hair biology with changes associated with alopecia. Researchers can ask whether a disorder is linked to altered growth activity, follicle regression, resting behavior, or shedding and renewed growth. This phase-based perspective helps organize observations of hair loss without treating every pattern as identical.
Understanding phase timing and duration can guide research into therapies that modify hair growth. It also supports work on follicle regeneration by identifying the cycle as a biological process that regenerative strategies may need to influence. The cycle therefore serves both as a subject of study and as a framework for considering effects on hair production or shedding.
Phase-based analysis connects follicle behavior with broader patterns of hair production and shedding. By considering matrix-cell activity, regression, rest, and renewed growth together, researchers can build a more complete picture of normal hair biology. This framework also makes it easier to recognize when observed hair changes may reflect altered cycle control rather than a single isolated event.