Healthy brain. Coloured three-dimensional Magnetic Resonance Image (MRI) scans of the human brain, showing six external views. The surface of the brain is seen from its left side (top left), right side (top right), in front view (middle left), in back view (middle right), top view (lower left), bottom view (lower right). The cerebrum of the brain is the largest region, appearing convoluted and forming two hemispheres (lower left). From the side the cerebellum is at ear level, lying under the cerebrum. The brainstem and spinal cord are seen at middle left (light green). Many MRI scan images are combined to achieve a 3-D image.