The body, or trunk, is the long, arched middle part of the corpus callosum between the genu and the splenium. It forms the roof of the central part of the lateral ventricles, and the septum pellucidum and fornix hang beneath it. Its fibres connect the frontal and parietal lobes, including the motor and sensory areas.
| Location | Middle arched part of the corpus callosum, above the lateral ventricles and fornix |
|---|---|
| Connections |
|
| Blood Supply | Anterior cerebral artery (pericallosal artery) |
Connects the frontal and parietal lobes of the two hemispheres, coordinating movement and sensation between the two sides.
Lesions of the body can cause disconnection signs such as apraxia of the left hand on verbal command, because the instruction formed in the left hemisphere cannot reach the right motor cortex. Diffuse axonal injury and multiple sclerosis often affect this part. Surgeons divide its front part in anterior callosotomy for epilepsy.
Inability to carry out verbal commands with the left hand after damage to the body of the corpus callosum.
Shearing injury from head trauma that commonly affects the corpus callosum.
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