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The Surfaces of the cerebellum and brain stem

Inferior aspect

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Image #23-5
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The Surfaces of the cerebellum and brain stem
Inferior aspect
The specimen seen in the previous view is now turned to reveal its basal surfaces. The vertebral and basilar arteries have been cut away so that the pons and medulla are more completely visualized.
1 . Rostral lamina of corpus callosum (cut across)
2 . Subcallosal gyrus (cut across)
3 . Olfactory tract
4 . Optic chiasm
5 . Amygdaloid nucleus
6 . Hippocampus
7 . Superior cerebellar artery right
8 . Pons
9 . Trigeminal nerve (V)
10 . Facial nerve (VII)
11 . Vestibulocochlear nerve (VIII) and horizontal cerebellar sulcus
12 . Choroid plexus fourth ventricle
13 . Pyramid [medullae oblongatae]
14 . Olive
15 . Posterior inferior cerebellar artery (in this case arising from the vertebral artery of the same side)
16 . Inferior semilunar lobe (crus II ansiform lobule)
17 . Branch posterior inferior cerebellar artery (PICA)
18 . Head of caudate nucleus
19 . Frontal part internal capsule
20 . Lentiform nucleus (putamen)
21 . Lateral cerebral fissure and limen insulae
22 . Mamillary body
23 . Cerebral peduncle
24 . Trochlear nerve (IV)
25 . Quadrangular lobe of cerebellum
26 . Abducens nerve (Vl) and anterior inferior cerebellar artery
27 . Flocculus
28 . Superior semilunar lobe (crus I ansiform lobule)
29 . Posterior inferior cerebellar artery (origin from basilar artery)
30 . Glossopharyngeal (IX) and vagus (X) nerves
31 . Hypoglossal nerve (XII)
32 . Tonsil (ventral paraflocculus)
33 . Biventral lobule (dorsal paraflocculus)
34 . Pyramidal decussation
35 . Posterior cerebellar incisura