Brain, Cross-Sectional View
In this image, the head is cross-sectioned to reveal the brain within the skull. The two types of brain tissue are visible: gray matter and white matter. These names derived from their appearance to the naked eye. Gray matter is made up of the cell bodies of nerve cells. White matter is made up of the long filaments that extend from the cell bodies transmitting the electrical signals that carry the messages between neurons (cell in the nervous system.)
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