Which structure enables interhemispheric communication by connecting analogous areas between the left and right hemispheres?

• A. Corpus Callosum
• B. Internal Capsule
• C. Superior Longitudinal Fasciculus
• D. Arcuate Fasciculus

Answer: (A)

Interhemispheric communication relies on a major bridge that directly links homologous areas of the left and right hemispheres, allowing the two sides of the brain to coordinate and share information. This structure is the corpus callosum, a large bundle of nerve fibers that runs along the midline and connects almost every part of one hemisphere with its counterpart in the other. By transmitting a vast array of axons between cortical regions, it enables integrated sensory processing, motor control, and higher cognitive functions that require bilateral coordination.

The internal capsule carries projection fibers between the cortex and subcortical structures, not cross-hemisphere connections. The superior longitudinal fasciculus is an association tract that links regions within a single hemisphere, not across hemispheres. The arcuate fasciculus connects language-related areas within one hemisphere (typically between Broca’s and Wernicke’s areas), and is not the pathway that bridges the two hemispheres.