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The cerebrum is considered the largest part of the brain and is responsible for many complex functions, including voluntary muscle movements, speech, thought, emotions, reading, writing, and problem solving. It is divided into two hemispheres and further subdivided into four lobes: the frontal, parietal, temporal, and occipital lobes. Each of these areas has specific functions that contribute to the overall processing of sensory information and the coordination of body functions.

In contrast, the cerebellum is smaller and primarily responsible for coordination and balance. The brainstem, which connects the brain to the spinal cord, controls basic life functions such as breathing and heart rate. The hippocampus, while vital for memory and learning, is considerably smaller and is part of the limbic system, which is crucial for emotional responses and certain types of memory.

Understanding the size and role of the cerebrum provides insight into its essential functions in daily activities and overall brain health.