corpus callosum

corpus cal·lo·sum -ka-'lō-səm n, pl corpora cal·lo·sa -sə the great band of commissural fibers uniting the cerebral hemispheres

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the broad band of nervous tissue that connects the two cerebral hemispheres, containing an estimated 300 million fibres. See cerebrum.

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[TA] an arched mass of white matter, found in the depths of the longitudinal fissure, composed of three layers of fibers, the central layer consisting primarily of transverse fibers connecting the cerebral hemispheres; its subsections, from anterior to posterior, are called the rostrum, genu, trunk (or body), and splenium.

Corpus callosum in a midline sagittal section.