What is the name of the largest part of the brain?

The largest part of the brain is called the cerebrum, which makes up about 85% of the brain's total weight. It is divided into two hemispheres and is responsible for many of the brain's higher functions, including voluntary movements, sensory processing, language, reasoning, and complex thought. The cerebrum is also divided into four lobes: the frontal, parietal, temporal, and occipital lobes, each of which plays a specific role in processing different types of information.

The role of the cerebellum, brainstem, and thalamus is significantly different. The cerebellum coordinates voluntary movements and is involved in balance and motor control. The brainstem regulates basic life functions such as breathing, heart rate, and blood pressure. The thalamus acts as a relay station for sensory information, directing it to the appropriate areas of the cerebrum for processing. While important, these structures do not match the size or the range of functions attributed to the cerebrum.