Healthy brain. Coloured Computed Tomography (CT) scan through a human brain in sagittal (side) view. The front of the brain is at upper left. At top, the cerebrum has folds and convolutions; the cerebrum is the largest region of the brain and is involved in conscious and intelligent thought, memory, speech and language. Beneath it (at lower right) is the smaller cerebellum, also highly folded; it maintains body posture, balance, and coordinates movement. The brainstem (at lower centre) controls basic functions such as breathing and is linked to the spinal cord (at bottom). CT scanning uses Xrays to create slice images through regions of the head and body.