Structure and Function of Skin, Hair, and Nails

May 2021 in “ Medicine ”

Joey E. Lai‐Cheong, John A. McGrath

skin hair nails epidermis hair follicles dermis collagen elastic fibers psoriasis eczema skin cancer melanocytes hair cycle

TLDR Understanding skin, hair, and nails is crucial due to their complexity and impact on health.

The document provided an overview of the structure and function of the skin, hair, and nails, emphasizing the complexity of the skin as the largest organ of the human body. It highlighted the multilayered stratified epidermis, adnexal structures like hair follicles, and the dermis with collagen and elastic fibers. The text noted that over 1,000 skin-related diseases have been identified, with conditions such as psoriasis, eczema, and skin cancer significantly impacting healthcare resources and patient quality of life. Understanding the biology of healthy skin and the pathophysiology of skin diseases was deemed essential. The document also included questions to test knowledge on skin structure and function, such as the location of melanocytes and the phases of the hair cycle.

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