Which brain structure serves as a major interhemispheric connector?

• A. Cingulate Gyrus
• B. Corpus Callosum
• C. Arcuate Fasciculus
• D. Angular Gyrus

Answer: (B)

The key idea is that the corpus callosum acts as the main bridge between the two hemispheres, a large bundle of nerve fibers that connects corresponding cortical areas across sides. This major interhemispheric connector enables rapid, coordinated communication for sensory, motor, and cognitive processing. Other structures mentioned have different roles: the cingulate gyrus is part of the limbic system involved in emotion and autonomic functions; the arcuate fasciculus links language areas within a single hemisphere (frontal to temporal) as part of the language network; the angular gyrus is a parietal region involved in linking language, number processing, and spatial cognition but does not serve as the primary cross-hemisphere connector. So the corpus callosum stands out as the primary interhemispheric communication pathway, crucial for integrated brain function.