Which structure is severed in a split-brain operation to isolate the hemispheres?

Which structure is severed in a split-brain operation to isolate the hemispheres?

• A. Amygdala
• B. Hippocampus
• C. Corpus Callosum
• D. Thalamus

Answer: (C)

In split-brain surgeries, the goal is to stop information from crossing between the two sides of the brain. The key pathway for that cross-hemispheric communication is the corpus callosum, a large bundle of nerve fibers that connects the left and right cerebral hemispheres. By severing it, the hemispheres become isolated and can operate with limited or no direct communication between them. The other structures listed have important roles but are not the main bridge between the hemispheres. The amygdala is involved in emotion processing, the hippocampus in forming and retrieving memories, and the thalamus in relaying sensory information to the cortex. Cutting any of these would cause a range of other deficits, not the targeted isolation of the two hemispheres. The corpus callosum is the specific structure that, when severed, effectively disconnects the two sides of the brain.

In split-brain surgeries, the goal is to stop information from crossing between the two sides of the brain. The key pathway for that cross-hemispheric communication is the corpus callosum, a large bundle of nerve fibers that connects the left and right cerebral hemispheres. By severing it, the hemispheres become isolated and can operate with limited or no direct communication between them.

The other structures listed have important roles but are not the main bridge between the hemispheres. The amygdala is involved in emotion processing, the hippocampus in forming and retrieving memories, and the thalamus in relaying sensory information to the cortex. Cutting any of these would cause a range of other deficits, not the targeted isolation of the two hemispheres. The corpus callosum is the specific structure that, when severed, effectively disconnects the two sides of the brain.