Head and neck. Colour-converted sagittal magnetic resonance imaging (MRI) scan of a human head and neck. The image plane passes vertically through the centre of the body, with the front of the head at left. The brain's cerebrum (green) surrounds the midbrain structures (blue, orange and pink). The brainstem (yellow) becomes the spinal cord (yellow), which is encased by the vertebrae (orange) of the spine. The intervertebral discs (green) are also shown. The cerebellum (red) at the rear and base of the brain is also shown. This image includes additional 3D conversion of scan data for the cervical vertebrae, the brainstem, the midbrain, and the spinal cord.