Normal Hair Structure And Physiology

    January 2026 in “ Updates in clinical dermatology ”
    Rebecca H. Goldberg, Lynne J. Goldberg
    TLDR Hair grows in cycles, and disruptions can cause hair loss.
    The document discusses the structure and physiology of hair follicles, which are dynamic structures that undergo cyclic morphological changes. Hair follicles form in utero through complex interactions and reach their maximum number at birth. Each follicle consists of epithelial and mesenchymal layers surrounding the hair shaft, forming a follicular unit with sebaceous glands. Hair growth occurs in cycles, genetically determined, and disruptions in this cycle can lead to hair loss or alopecia. Understanding the hair follicle's embryology, anatomy, physiology, and hair cycle is crucial for diagnosing and treating hair disorders.
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