corpus callosum
US /ˌkɔːr.pəs kəˈloʊ.səm/
UK /ˌkɔːr.pəs kəˈloʊ.səm/

1.
a broad band of nerve fibers joining the two hemispheres of the brain.
:
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The corpus callosum facilitates communication between the left and right sides of the brain.
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Damage to the corpus callosum can lead to various neurological deficits.