Corpus callosum

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Brain: Corpus calluposum
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Corpus callosum from below. (Anterior portion is at the top of the image.)
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Median sagittal section of brain (person faces to the left). Corpus callosum visible at center, in light gray.)
Gray's subject #189 828
NeuroNames hier-173
MeSH Corpus+Callosum

The corpus callosum (call ō sum) is the largest connective pathway in a human brain. It is made of more than 200 million nerve fibers that connect the left and right sides (hemispheres) of the brain.