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Body of corpus callosum

The body of the corpus callosum is the central, largest segment of the corpus callosum—the major commissural fiber tract connecting the left and right cerebral hemispheres. It forms the main bridge for interhemispheric communication and is positioned superior to the lateral ventricles. Understanding its detailed anatomy, blood supply, venous drainage, function, and characteristic imaging appearances is essential for accurate diagnosis and evaluation of various neurological conditions.

Synonyms:

  • Trunk of corpus callosum

  • Central part of corpus callosum

  • Corpus corporis callosi (Latin)

Arterial Supply:

  • Primarily by the pericallosal arteries, which are branches of the anterior cerebral arteries (ACA), specifically from the callosal and precallosal branches.

  • Minor contributions from the anterior communicating artery and the medial callosal branches.

Venous Drainage:

  • Drained mainly via the callosal veins into the anterior septal vein.

  • Ultimately drains into the internal cerebral veins, then into the great cerebral vein of Galen.

Function:

  • Facilitates communication between the left and right cerebral hemispheres.

  • Integrates sensory, motor, and cognitive information across both sides of the brain.

  • Essential for coordinated, bilateral cerebral functions.

MRI Appearance:

  • T1-weighted images:

    • The body of the corpus callosum appears slightly hyperintense (brighter) compared to the surrounding brain parenchyma.

  • T2-weighted images:

    • It is slightly hypointense (darker) relative to the adjacent brain tissue.

  • FLAIR (Fluid-Attenuated Inversion Recovery):

    • Also appears slightly hyperintense compared to surrounding brain tissue.

CT Appearance:

  • The body of the corpus callosum appears as a well-defined, homogeneous structure with attenuation similar to or slightly higher than the surrounding white matter.

  • No contrast enhancement is typically seen in healthy individuals.

  • Calcification is rare but may be seen in some pathological states.

MRI images

Body of corpus callosum mri 3t coronal image

MRI images

Body of corpus callosum mri 3t sagittal image