At the Level of Inferior Colliculus

1. Commissure of inferior colliculus
2. Inferior colliculus
3. Periaqueductal gray
4. Cerebral aqueduct
5. Brachium of inferior colliculus
6. Corpus parabigeminum
7. Lateral lemniscus
8. Mesencephalic tract and nucleus of trigeminal nerve
9. Trochlear nucleus
10. Medial longitudinal fasciculus
11. Central tegmental tract

12. Tectospinal tract
13. Decussation of superior cerebellar peduncle
14. Spinal lemniscus
15. Medial lemniscus
16. Substantia nigra
17. Parietotemporooccipitopontine tracts
18. Corticospinal and corticobulbar tracts
19. Frontopontine tract
20. Interpeduncular nucleus
21. Interpeduncular fossa
22. Oculomotor nerves

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