HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Spinal cord. Light micrograph of a section through a normal human spinal cord, showing the grey matter (centre, blue) and white matter that surrounds it. The spinal cord begins at the base of the brainstem, and extends down to the space between the first and second lumbar vertebrae. It consists of two distinct areas: grey matter, which contains the nerve cell bodies; and white matter, which contains the myelinated nerve fibres (axons). Magnification: x2.8 when printed 10 centimetres wide.
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