STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Hair follicle. Coloured scanning electron micrograph (SEM) of a transverse freeze-fractured section through a hair shaft and follicle (round structures at centre). The internal layers of the follicle and shaft are exposed. The shaft is the innermost structure (purple) and is surrounded by its root sheath (brown/pink layers) that is part of the follicle, the structure from which a hair grows from the skin. Further outwards, there are layers of connective tissue that make up the outer part of the follicle. In the surrounding skin is the smooth muscle (dark brown arc, lower right) of the arrector pili muscle that makes a hair shaft stand erect. Magnification: x200 at 6x7cm size.
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