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White matter fibres, DTI scan
White matter fibres. Coloured diffusion tensor imaging (DTI) scan of the bundles of white matter nerve fibres in the cerebrum, side view. This is the right hemisphere of the brain. At bottom is the brain stem, and arching around the centre is the corpus callosum which connects the two brain hemispheres. White matter fibres transmit nerve signals between brain regions and between the brain and the spinal cord. The cerebrum controls conscious thought and voluntary movement. DTI scans show the diffusion of water along white matter fibres, allowing the connections between brain regions to be mapped.
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