STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Brain arteries. Coloured scanning electron micrograph (SEM) of several cerebral arteries (green) from beneath the brain's arachnoid mater membrane (brown). The arteries are sectioned, showing their hollow tube structure. The internal surface of a blood vessel is lined with endothelial cells. Magnification unknown.
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