Natural size. And has the following characteristics: 1. Left hemisphere. The cortex of the cerebrum and cerebellum relax; 2. Pass through the middle section of the brain; 3. Cerebral ventricles (opened) and stem ganglia (viewed from above); 4. Pass through the horizontal section of the left hemisphere. Right: Lateral ventricle (open) and adjacent choroidal choroidal nucleus. 5. Passing through the frontal lobe of the brain and brainstem, showing the subcortical nucleus and projection tract.