Which structure connects the two cerebral hemispheres?

Which structure connects the two cerebral hemispheres?

• A. Corpus callosum
• B. Pineal gland
• C. Pituitary gland
• D. Thalamus

Answer: (A)

Interhemispheric communication is provided by a large bundle of myelinated nerve fibers that connects the two cerebral hemispheres. This structure, the corpus callosum, sits deep in the brain, spanning the fissure between the hemispheres and containing axons that rapidly transfer information between sides. By allowing signals to cross from one hemisphere to the other, it coordinates activities that involve both halves of the brain, such as certain aspects of language and spatial processing. The other structures have different roles: the pineal gland secretes melatonin to regulate sleep, the pituitary gland releases hormones that control other glands, and the thalamus acts as a relay hub for sensory information—none of these directly link the two hemispheres.

Interhemispheric communication is provided by a large bundle of myelinated nerve fibers that connects the two cerebral hemispheres. This structure, the corpus callosum, sits deep in the brain, spanning the fissure between the hemispheres and containing axons that rapidly transfer information between sides. By allowing signals to cross from one hemisphere to the other, it coordinates activities that involve both halves of the brain, such as certain aspects of language and spatial processing. The other structures have different roles: the pineal gland secretes melatonin to regulate sleep, the pituitary gland releases hormones that control other glands, and the thalamus acts as a relay hub for sensory information—none of these directly link the two hemispheres.