MANFRED KAGE / SCIENCE PHOTO LIBRARY MANFRED KAGE / SCIENCE PHOTO LIBRARY
Motor neuron. Coloured Scanning Electron Micrograph (SEM) of a motor neuron cell body from the human spinal cord. The light disc at centre is the cell nucleus. Three axons, or dendrites, are seen leading from the cell (upper left, upper right and lower right). These carry electrical impulses from the central nervous system to "effector" organs in the rest of the body. They are responsible, for example, for making muscles contract. Motor neuron cell bodies are found in the brain or spinal cord. Axons can be up to several metres long and carry nerve impulses at up to 430 km per hour. Magnification: x1000 at 6x7cm size.
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