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Accessory Structures of the Skin: Hair Growth and Types01:20

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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...
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A hair follicle or HF is a small part of the skin that produces the hair shaft. Paul Gerson Unna was the first to observe a bulge in the human hair follicle's outer root sheath (ORS). The bulge is present between the sebaceous gland and the arrector pili muscle and is the niche for hair follicle stem cells (HFSCs). The bulge is also a niche for melanocyte stem cells, and their loss results in graying of hair. The HFSCs express Sox9 and Lhx2, which help them maintain stemness and prevent...
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Hair and hair follicles are integral components of the integumentary system. Hair is a filamentous structure composed mainly of a protein called keratin. It is found on the surface of the skin throughout the body, except for areas such as the palms of the hands and soles of the feet.
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While variables are sometimes correlated because one does cause the other, it could also be that some other factor, a confounding variable, is actually causing the systematic movement in our variables of interest. For instance, as sales in ice cream increase, so does the overall rate of crime. Is it possible that indulging in your favorite flavor of ice cream could send you on a crime spree? Or, after committing crime do you think you might decide to treat yourself to a cone?
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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Related Experiment Video

Updated: Feb 26, 2026

A New Technique for Quantitative Analysis of Hair Loss in Mice Using Grayscale Analysis
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Hair Loss Myths.

Gabriella DiMarco, Amy McMichael

    Journal of Drugs in Dermatology : JDD
    |July 12, 2017
    PubMed
    Summary

    Many common hair loss myths lack scientific evidence. Dermatologists should guide patients toward proven treatments rather than unverified remedies for effective hair loss management.

    Area of Science:

    • Dermatology
    • Trichology

    Background:

    • Hair loss is a frequent dermatological concern.
    • Patients often hold misconceptions about hair loss causes and treatments.
    • Self-treatment attempts can lead to frustration and misinformation.

    Purpose of the Study:

    • To identify and evaluate common myths surrounding hair loss.
    • To examine the scientific evidence supporting or refuting these myths.
    • To provide evidence-based guidance for managing hair loss.

    Main Methods:

    • Identification of 12 prevalent hair loss myths.
    • Categorization of myths into treatment types (minoxidil, supplements, topicals) and practices.
    • Systematic literature search using PubMed to assess evidence for each myth.

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    Main Results:

    • Substantial lack of scientific evidence supporting many common hair loss myths.
    • Some myths were directly contradicted by findings from randomized controlled trials.
    • Evidence for the efficacy of certain therapies was identified.

    Conclusions:

    • Many popular hair loss beliefs are not scientifically validated.
    • Insufficient research exists for numerous therapies and hair care practices.
    • Prioritizing treatments with established efficacy is crucial for patient care.