JOHN BAVOSI / SCIENCE PHOTO LIBRARY JOHN BAVOSI / SCIENCE PHOTO LIBRARY
Multiple sclerosis. Illustration of the brain and spinal cord of a woman suffering from multiple sclerosis (MS). Also seen in the image is a magnified view of the spinal cord (upper right) showing individual nerve fibres. At lower right is a magnified view of an axon within one of the nerve fibres which is covered with a protective myelin sheath (grey). In MS, patches of the myelin sheath are destroyed. These patches of destroyed myelin are known as plaques (black). The affected nerve fibres cannot conduct nerve impulses properly, so body functions such as movement and sensation are lost. The cause of MS is not known.
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