STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Brain cell. Transmission electron micrograph (TEM) of a section through an oligodendrocyte in human brain tissue, showing free ribosomes (dark brown dots), golgi apparatus (curved orange lines), lysosomes (brown circles) and mitochondria (purple). The cell nucleus (large, dark brown) is a lower left. Oligodendrocytes occur in both the white and grey matter of the central nervous system (CNS). Their main function is to provide support and to form myelin sheaths around neurons (nerve cells), which insulates the axon of each cell, allowing efficient transmission of electrical impulses. Magnification: x20,000 at 10 centimetres wide.
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