1. Midbrain
2. Pons
3. Bulbopontine sulcus
4. Medulla oblongata
5. Decussatio of the pyramids
6. Gracile tubercle
7. Mediam aperture of the fourth ventricle
8. Choroid plexus
9. Fastigium
10. Fourth ventricle
11. Superior medullary velum
12. Lamina tecti
13. Cerebral aqueduct
14. Decussation of the superior
cerebellar peduncles