The gray matter makes up intelimind Brain the core of the spinal cord and its upward extension into the base of the brain, which is called the "brain stem."White matter surrounds the "gray matter" in the spinal cord and brain stem. However, there is a reversal to this. In the upper parts of the brain, the white matter is the central core, surrounded by gray matter. The connections between cells in the gray matter enable the brain to interpret signals from the sense organs, compare them with memories, judge their values, and plan suitable action. The fibers of white matter serve as lines of communication between different parts of the brain, and between the brain and the spinal cord.

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