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    Did you mean Hair Shaft?
    Glossary Hair Shaft

    visible part of hair extending above the skin's surface

    The hair shaft is the visible part of the hair that extends above the skin's surface. It is composed of three layers: the cuticle (outer layer), the cortex (middle layer), and the medulla (inner layer). The hair shaft is primarily made of keratin, a protein that provides strength and resilience. Understanding the structure of the hair shaft is crucial for professionals in dermatology and cosmetology, as it influences hair health, texture, and response to treatments.

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    1. Krtap11-1, a hair keratin-associated protein, as a possible crucial element for the physical properties of hair shafts Journal of Dermatological Science · 2014 · 38 citations
    2. Secretory phospholipase A2-IIA overexpressing mice exhibit cyclic alopecia mediated through aberrant hair shaft differentiation and impaired wound healing response Scientific Reports · 2017 · 7 citations
    3. Physical and mechanical properties of the hair shaft: A review of measurement techniques to verify the efficacy of cosmetic products Seven Editora eBooks · 2024
    4. Mitochondrial DNA Variation in Human Hair Shafts Influenced by Physical Characteristics: A Massively Parallel Sequencing Analysis Genes · 2026
    5. l-Ascorbic acid 2-phosphate promotes elongation of hair shafts via the secretion of insulin-like growth factor-1 from dermal papilla cells through phosphatidylinositol 3-kinase 2009 · 34 citations
    6. A 2% Oleosome-FGF-2 Fusion Extract Scalp Serum Improves Photo-trichogramDerived Hair Density, Anagen/Telogen Ratio, Hair Shaft Thickness, and Scalp Barrier Parameters in Women with Shedding-Prone Hair: A Randomized, SingleBlind, Placebo-Controlled Pilot Study International Journal of Clinical & Experimental Dermatology · 2026
    7. Effects of ultraviolet B radiation on physicochemical properties of human hair shaft Microscopy Research and Technique · 2012 · 5 citations
    8. Comparative Studies of the Diameters of Hairshafts in Anagen and in Telogen Phases in Male Adults Without Alopecia and in Male Adults With Androgenetic Alopecia 1981 · 6 citations
    9. Angora Mouse Mutation: Altered Hair Cycle, Follicular Dystrophy, Phenotypic Maintenance of Skin Grafts, and Changes in Keratin Expression Veterinary Pathology · 1997 · 69 citations
    10. Anatomy and Physiology of Hair InTech eBooks · 2017 · 14 citations
    11. The hair eclipse phenomenon: sharpening the focus on the hair cycle chronobiology International Journal of Cosmetic Science · 2003 · 14 citations
    12. Effects of UV Induced-Photoaging on the Hair Follicle Cycle of C57BL6/J Mice Clinical, cosmetic and investigational dermatology · 2021 · 10 citations
    13. Cornu cervi pantotrichum Pharmacopuncture Solution Facilitate Hair Growth in C57BL/6 Mice Journal of Pharmacopuncture · 2016 · 4 citations
    14. Normal Hair Structure and Physiology Updates in clinical dermatology · 2026
    15. Relationship among Natures of Scalp Skin, Hair Follicle and Hair Shaft in Young Females. Journal of Society of Cosmetic Chemists of Japan · 1991
    16. Determination of the pH Gradient in Hair Follicles of Human Volunteers Using pH-Sensitive Melamine Formaldehyde-Pyranine Nile Blue Microparticles Sensors · 2020 · 13 citations
    17. Dihydrotestosterone-Inducible IL-6 Inhibits Elongation of Human Hair Shafts by Suppressing Matrix Cell Proliferation and Promotes Regression of Hair Follicles in Mice Journal of Investigative Dermatology · 2011 · 173 citations
    18. `Cyclic alopecia' in<i>Msx2</i>mutants: defects in hair cycling and hair shaft differentiation Development · 2002 · 158 citations
    19. Pharmacologic interventions in aging hair Clinical Interventions in Aging · 2006 · 80 citations
    20. The hair growth promoting effect of ascorbic acid 2-phosphate, a long-acting Vitamin C derivative Journal of Dermatological Science · 2006 · 33 citations
    21. Low-sulfur hair syndrome associated with UVB photosensitivity and testicular failure Journal of the American Academy of Dermatology · 1984 · 30 citations
    22. The effect of cilostazol, a phosphodiesterase 3 (PDE3) inhibitor, on human hair growth with the dual promoting mechanisms Journal of Dermatological Science · 2018 · 21 citations
    23. 7-Phloroeckol promotes hair growth on human follicles in vitro Naunyn-Schmiedeberg's Archives of Pharmacology · 2014 · 17 citations
    24. 6-Gingerol Inhibits Hair Shaft Growth in Cultured Human Hair Follicles and Modulates Hair Growth in Mice PLOS ONE · 2013 · 17 citations
    25. The effects of phosphodiesterase 3 (PDE3) inhibitor on hair follicle cell viability and hair growth Seoul National University Open Repository (Seoul National University) · 2020 · 1 citations
    26. Study of the Physicochemical Properties of Different Hair and Body Shampoo Samples Available in the Local Market of Al Khums, Libya   Lebda Medical Journal · 2026
    27. Can Plant Extracts Help Prevent Hair Loss or Promote Hair Growth? A Review Comparing Their Therapeutic Efficacies, Phytochemical Components, and Modulatory Targets 2024
    28. PD-L1 vNAR promotes hair growth by modulating hair shaft elongation through activating the leptin-STAT3 signaling Cell Communication and Signaling · 2026
    29. MLPH-mediated activation of dermal papilla IGF-1 signaling drives human hair shaft elongation and anagen induction Biomedicine & Pharmacotherapy · 2026
    30. In Vivo Non-Invasive Observation of Dynamic Changes in Hair Shaft, Melanin, and Collagen During the C57BL/6 Follicle Cycle bioRxiv (Cold Spring Harbor Laboratory) · 2025