What links the two hemispheres of the brain?

The corpus callosum is a large band of nerve fibres that connects the two hemispheres of the brain. It is located deep in the brain, in a region called the longitudinal fissure, and is the main pathway for communication between the left and right hemispheres of the brain.

The corpus callosum allows for the exchange of information and coordination of activities between the two hemispheres. It is involved in many functions that require communication between the two sides of the brain, such as language processing, spatial orientation, and sensory integration.

The other options listed are not correct. The interhemispheric canal is not a structure in the brain, and the cerebral aqueduct is a structure in the midbrain that connects the third and fourth ventricles of the brain. The spinal cord is a part of the central nervous system that connects the brain to the rest of the body, but it does not link the two hemispheres of the brain.