Which structure connects the left and right cerebral hemispheres and carries messages between them?

Which structure connects the left and right cerebral hemispheres and carries messages between them?

• A. Corpus callosum
• B. Fornix
• C. Thalamus
• D. Hippocampus

Answer: (A)

Interhemispheric communication relies on a major white-matter tract that links the left and right cerebral hemispheres. This structure forms a thick bundle deep in the brain and acts as the primary bridge for sending messages between the sides, enabling coordinated perception, language, and movement. That’s why the corpus callosum is the best choice: it directly connects the two halves and carries information across. The other structures have different roles— the fornix is part of memory circuitry linking the hippocampus to other limbic areas, the thalamus serves as a relay station for sensory and motor signals to the cortex, and the hippocampus is key for forming new memories.

Interhemispheric communication relies on a major white-matter tract that links the left and right cerebral hemispheres. This structure forms a thick bundle deep in the brain and acts as the primary bridge for sending messages between the sides, enabling coordinated perception, language, and movement. That’s why the corpus callosum is the best choice: it directly connects the two halves and carries information across. The other structures have different roles— the fornix is part of memory circuitry linking the hippocampus to other limbic areas, the thalamus serves as a relay station for sensory and motor signals to the cortex, and the hippocampus is key for forming new memories.