Which structure links the left and right cerebral hemispheres and facilitates interhemispheric communication?

Which structure links the left and right cerebral hemispheres and facilitates interhemispheric communication?

• A. Corpus callosum
• B. Cingulate gyrus
• C. Hypothalamus
• D. Septo-hippocampal tract

Answer: (A)

Interhemispheric communication relies on a major white-matter bridge that connects the two hemispheres, allowing fast transfer of information between sides. This structure is the corpus callosum, the largest bundle of axons in the brain. It links homologous areas across the hemispheres and coordinates motor, sensory, and cognitive processes, making it the primary pathway for integrating activity between the left and right sides. The cingulate gyrus is a cortical region involved in emotion, attention, and cognitive control, not the wide midline bridge between hemispheres. The hypothalamus handles autonomic and endocrine regulation and various basic drives, not interhemispheric signaling. The septo-hippocampal tract connects the septal area to the hippocampus and is involved in memory and learning, not linking the two hemispheres.

Interhemispheric communication relies on a major white-matter bridge that connects the two hemispheres, allowing fast transfer of information between sides. This structure is the corpus callosum, the largest bundle of axons in the brain. It links homologous areas across the hemispheres and coordinates motor, sensory, and cognitive processes, making it the primary pathway for integrating activity between the left and right sides.

The cingulate gyrus is a cortical region involved in emotion, attention, and cognitive control, not the wide midline bridge between hemispheres. The hypothalamus handles autonomic and endocrine regulation and various basic drives, not interhemispheric signaling. The septo-hippocampal tract connects the septal area to the hippocampus and is involved in memory and learning, not linking the two hemispheres.