Corpus callosum

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Brain: Corpus calluposum
Corpus callosum from below. (Anterior portion is at the top of the image.)
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.