X CLOSE

Exploration of the left half of the cerebellum and brain stem from its inferior and medial aspect

Lobulus semilunaris superior viewed from below; horizontal sulcus of cerebellum

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Image #26-7
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Exploration of the left half of the cerebellum and brain stem from its inferior and medial aspect
Lobulus semilunaris superior viewed from below; horizontal sulcus of cerebellum
The dissected area has been extended upward by removing the lobulus gracilis and the inferior semilunar lobule. The entire length of the horizontal sulcus is exposed, from its shallow midline groove betwen the folium (13) and tuber vermis, to its lateral termination along the outer surface of the brachium pontis (6). The arteries within the sulcus are derived from the posterior inferior cerebellar artery. On the upper surface of the cerebellum small branches of these arteries communicate with branches of the superior cerebellar artery.
1 . Branch of posterior inferior cerebellar artery (PICA)
2 . Superior semilunar lobe (crus I ansiform lobule)
3 . Approximate position of dentate nucleus (within depths of specimen)
4 . Medullary center of cerebellar tonsil
5 . Floccular peduncle
6 . Brachium pontis (middle cerebellar peduncle)
7 . Quadrangular lobule of cerebellum
8 . Flocculus (dissected)
9 . Pyramid (medulla oblongata)
10 . Trigeminal nerve (V)
11 . Oculomotor nerve (III)
12 . Declive of cerebellum
13 . Folium vermis
14 . Primary fissure
15 . Medullary center of culmen
16 . Nodulus
17 . Central lobule
18 . Cerebellar lingula