Which brain region is the largest and most superior portion of the brain?

• A. Cerebellum
• B. Brainstem
• C. Cerebrum
• D. Diencephalon

Answer: (C)

The cerebrum is the largest and most superior portion of the brain. It comprises the two cerebral hemispheres and forms the bulk of the brain’s mass, sitting on top of the brainstem and diencephalon. The outer layer, the cerebral cortex, is where higher-order functions occur—conscious thought, perception, memory, language, and voluntary control of movement. The other regions—the cerebellum at the back and bottom that coordinates balance and fine motor skills, the brainstem that governs essential life functions, and the diencephalon (including structures like the thalamus and hypothalamus) which sits centrally—are smaller or located deeper. That combination of being the largest and occupying the top/front portion of the brain is why the cerebrum is the correct choice.