Which part of the brain is the largest?

The cerebrum is the largest part of the brain and is responsible for many higher-order functions. It encompasses regions that control various aspects of voluntary movement, sensory processing, language, reasoning, and emotional response. The cerebrum is divided into two hemispheres, each containing four lobes: frontal, parietal, temporal, and occipital lobes. Given its size and the diverse range of functions it performs, it plays a crucial role in integrating neural signals and facilitating complex behaviors.

When considering the other parts, while the cerebellum is important for motor control and coordination, it is significantly smaller than the cerebrum. The brainstem, which governs basic life functions such as breathing and heart rate, is also smaller and sits at the base of the brain connecting it to the spinal cord. The frontal lobe, a component of the cerebrum, is just one of its lobes, which makes it a smaller structure in comparison to the whole cerebrum. Thus, in the context of the question, the cerebrum’s size and functional complexities confirm it as the largest part of the brain.