GUNILLA ELAM / SCIENCE PHOTO LIBRARY GUNILLA ELAM / SCIENCE PHOTO LIBRARY
Nerve cells in multiple sclerosis. Computer illustration showing the appearance of nerve cells (neurons, blue) in multiple sclerosis (MS). MS is a disease in which the myelin sheaths (yellow) that cover the axons (thin, blue) of nerve cells in the brain and spinal cord are damaged by cells of the immune system attacking and destroying the myelin cells. Myelin sheaths help facilitate the propagation of nerve signals along the axons, Damage to this system disrupts the ability of parts of the nervous system to communicate, leading to various physical and mental problems. Common symptoms of MS can include double vision or blindness in one eye, muscle weakness and loss of coordination.
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