STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Nerve fibres. Scanning electron micrograph (SEM) of a cut bundle of nerve fibres. Such a group of nerves fibres is a fasciculus. The bundle is held together by connective tissue in the form of strands of collagen. Each nerve fibre consists of a nerve cell axon, the output process of a nerve cell, covered its insulating fatty layer (myelin sheath). Myelin isolates the nerve from its surroundings, increasing the speed of nerve transmissions. Nerves collect, interpret and relay information. The fibres are used to pass the information on to other parts of the body, such as the muscles and organs like the brain. Magnification: x800 when printed at 10 centimetres tall.
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