What structure contains approximately 75% of the brain's total volume?

The cerebrum is the largest part of the brain, making up approximately 75% of its total volume. It is responsible for higher brain functions, including thought, action, and sensory processing. The cerebrum is divided into two hemispheres and has various lobes that govern different functions—such as the frontal lobe for reasoning and planning, the temporal lobe for memory and auditory processing, the parietal lobe for sensory information, and the occipital lobe for vision. This substantial volume reflects the cerebrum's role in complex cognitive processes and motor functions, as well as its involvement in integrating sensory information.

In contrast, the cerebellum, while significant for coordination and balance, is smaller in volume compared to the cerebrum. The brain stem, which controls fundamental life functions like heart rate and breathing, also occupies much less volume. The meninges, which are protective membranes covering the brain and spinal cord, do not have any volume considered as part of the brain’s anatomical structure. The prominence of the cerebrum sets it apart in terms of size and functional ability within the central nervous system.