Exploration of the cerebellum and brain stem from the medial aspect

Lateral lemniscus; medial lemniscus; course of trigeminal nerve through pons

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Image #27-3

Exploration of the cerebellum and brain stem from the medial aspect

Lateral lemniscus; medial lemniscus; course of trigeminal nerve through pons

The brachium conjunctivum has been partly removed and the tegmentum of the mesencephalon further dissected. The pigmented border of the substantia nigra (8) remains, but much of this nucleus was scraped away to demonstrate the cerebral peduncle (7). From the lower border of the substantia nigra white fibrous tissue appears to continue into the tegmentum of the pons.

1. Central lobule
2. Superior colliculus
3. Inferior colliculus
4. Lateral lemniscus
5. Ala central lobule
6. Medial lemniscus
7. Cerebral peduncle
8. Substantia nigra
9. Fibers passing into tegmentum from substantia nigra
10. Position of main sensory nucleus of trigeminal nerve and root of trigeminal nerve passing through brachium pontis (middle cerebellar peduncle) (lower pointer)
11. Oculomotor nerve (III)
12. Superior cerebellar artery
13. Posterior cerebral artery right
14. Branch of basilar artery to pons
15. Superior semilunar lobe (crus I ansiform lobule)
16. Horizontal cerebellar sulcus
17. Posterior inferior cerebellar artery (PICA)
18. Pyramid (vermis)
19. Brachium conjunctivum (superior cerebellar peduncle)
20. Fourth ventricle
21. Nucleus of vestibular nerve
22. Facial colliculus (dissected)
23. Striae medullares
24. Medial longitudinal fasciculus
25. Nucleus hypoglossal nerve
26. Longitudinal fasciculus (pyramidal) pontine
27. Superficial pontine fibers
28. Vertebral arteries