What department is predominant in the human skull?

The cerebral hemispheres occupy most of the human cranium. The brain is divided by a furrow into the right and left hemispheres. In addition to them, the cerebellum, diencephalon, midbrain, medulla oblongata, pons and trunk are also distinguished. There is a common misconception that the human brain works only 10-15%, but in fact we use it completely. It can be active up to 80% while performing some tasks. In addition, it requires a lot of energy and if there were unnecessary parts, they would disappear in the course of evolution.