The largest part of the brain is the cerebrum.
The cerebrum makes up about 85% of the brain’s total weight and is divided into two hemispheres: the left and right. Each hemisphere is further divided into four lobes—frontal, parietal, temporal, and occipital—that are responsible for various functions such as reasoning, movement, sensory processing, and visual interpretation.
The cerebrum’s size and complexity allow for the vast array of functions that characterize human intelligence, such as problem-solving, emotional responses, and language. Its outer layer, known as the cerebral cortex, is rich in neurons and plays a crucial role in all higher cognitive processes.