The hindbrain is made of the cerebellum, pons and medulla. Often the midbrain, pons, and medulla are referred to together as the brainstem. The Cerebrum: The cerebrum or cortex is the largest part of the human brain, associated with higher brain function such as thought and action.The cerebral cortex is divided into four sections, called lobes: the frontal lobe, parietal lobe, occipital lobe, and temporal lobe.his structure is responsible for basic vital life functions such as breathing, heartbeat, and blood pressure. Scientists say that this is the simplest part of human brains because animals' entire brains, such as reptiles (who appear early on the evolutionary scale) resemble our brain stem.