What is the largest part of the brain?

The largest part of the brain is the cerebrum. It accounts for about 85% of the brain's total weight and is divided into two hemispheres, each comprised of four lobes: the frontal, parietal, temporal, and occipital. The cerebrum is primarily responsible for higher brain functions such as thought, reasoning, planning, and processing sensory information, which includes visual, auditory, and tactile stimuli.

The design and function of the cerebrum allow it to integrate and interpret various signals from the body, enabling complex behaviors and cognitive processes. Its large surface area, characterized by numerous folds called gyri and grooves known as sulci, facilitates an increased capacity for neural connections and functions.

In comparison, the cerebellum, while important for motor control and coordination, is significantly smaller than the cerebrum. The brainstem plays crucial roles in basic life functions such as breathing and heart rate but is also much smaller in size. The diencephalon, which includes structures such as the thalamus and hypothalamus involved in sensory relay and regulatory functions, is smaller than the cerebrum as well. Thus, the cerebrum's considerable volume and functional significance establish it as the largest