At the Level of Inferior-Superior Colliculus Junction

1. Commissure of superior colliculus
2. Superior colliculus
3. Inferior colliculus
4. Brachium of inferior colliculus
5. Lateral lemniscus
6. Midbrain tegmentum
7. Periaqueductal gray
8. Cerebral aqueduct
9. Corpus parabigeminum
10. Mesencephalic tract and nucleus of trigeminal nerve

11. Trochlear nucleus
12. Medial longitudinal fasciculus
13. Central tegmental tract
14. Superior cerebellar peduncle
15. Red nucleus
16. Medial lemniscus
17. Substantia nigra
18. Cerebral peduncle
19. Posterior cerebral artery
20. Oculomotor nerves

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