Which structure connects the two brain hemispheres by a large band of neural fibers?

• A. Cerebellum
• B. Corpus callosum
• C. Thalamus
• D. Hypothalamus

Answer: (B)

Interhemispheric communication is achieved by a large bundle of neural fibers that connects the left and right cerebral hemispheres—the corpus callosum. This white-matter structure contains commissural fibers that cross the midline to transfer information between sides, enabling coordinated perception, movement, and higher cognitive processing. The cerebellum coordinates movement and balance, but it doesn’t serve as the main bridge between hemispheres. The thalamus acts as a relay station for sensory and some motor signals to the cortex, not the primary connector between hemispheres. The hypothalamus governs hormonal and autonomic functions, also not the major interhemispheric channel.