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1 Flocculonodular lobe. Lobus flocculonodularis. Small archicerebellar portion of the cerebellum located caudal to the dorsolateral fissure.

2 Nodulus. Medial protuberance of the vermis united with the flocculus by the peduncles. E

3 Flocculus. Claw-like portion of the cerebellum between the inferior cerebellar peduncle and biventral lobule. E

4 Peduncle of flocculus. Pedunculus floccularis. Band of nerve fibers connecting the flocculus to the nodulus. Part of it extends into the inferior medullary velum. E

5 Paraflocculus. In humans, a small insignificant part of the caudal lobe of the cerebellum that communicates with the flocculus.

6 Archicerebellum. Archaeocerebellum. Phylo-genetically the oldest part of the cerebellum; it consists of the lingula and the flocculonodular lobe. A

7 Paleocerebellum. An old part of the cerebellum consisting of the central lobule, culmen, pyramid, uvula, ala of the central lobule and quadrangular lobule. A

8 Neocerebellum. Phylogenetically young portion of the cerebellum; it comprises the declive, folium, tuber, lobulus simplex, cranial and caudal semilunar lobules, paramedian lobule and tonsil. A

9 CEREBELLAR SECTIONS. Sectiones cerebellares. Anatomical subdivisions of the cerebellum.

10 Arbor vitae [cerebelli]. Treelike pattern of the white matter seen in prepared sections of the cerebellum. C

11 Medullary body. Corpus medullare. White matter consisting of myelinated fibers. C

12 White laminae. Laminae albae. White matter extending into the folia from the medullary body. C

13 Cerebellar cortex. Cortex cerebellaris. Superficial gray matter of the cerebellum, about 1 mm thick, that consists pirmarily of nerve cells. B C

14 Molecular (plexiform) layer. Stratum moleculare (plexiforme). External cortical layer rich in dendrites and axons, poor in cell bodies. The nuclei of the Purkinje cells are found at its border with the granular layer.

15 Purkinje cell layer. Stratum neurium piri-formium. The layer in which the perikarya of the Purkinje cells are located. B

16 Stratum granulosum. Internal nuclear layer containing numerous closely packed small neurons. B

17 Nuclei of cerebellum. Nuclei cerebellaris.

18 Dentate nucleus. Nucleus dentatus. Large cerebellar nucleus located in the medullary body and resembling a folded pouch. C

19 Hilum of dentate nucleus. Hilum nuclei dentati. Opening of dentate nucleus from which emerges most of the superior cerebellar peduncle. C

20 Emboliform nucleus. Nucleus emboliformis. It is found just in front of the hilum of the dentate nucleus. C

21 Globose nucleus. Nucleus globosus. It lies medial to the dentate nucleus. C

22 Fastigial nucleus. Nucleus fastigii. The most medial of the deep cerebellar nuclei. C

23 Cerebellar peduncles. Pedunculi cerebellares. Fibers that provide connections to and from the cerebellum.

24 Inferior cerebellar peduncle (restiform body). Pedunculus cerebellaris inferior. Inferior connection to the cerebellum formed by fibers of the posterior spinocerebellar tract and olive. E F

25 Middle cerebellar peduncle (brachium pon-tis). Pedunculus cerebellaris medius (pon-tinus). Large peduncle containing fibers originating from the pontocerebellar tract. E F

26 Superior cerebellar peduncle (brachium conjunctivum). Pedunculus cerebellaris superior. Superior, paired (right and left) connecting fibers extending from the cerebellum to the brain stem. The superior medullary velum extends between them. E F

27 MIDBRAIN. Mesencephalon. It consists of cerebral crura, tegmentum and quadrigeminal plate (tectal lamina).

28 Cerebral peduncle. Pedunculus cerebri (cere-bralis). It comprises the cerebral crura and the tegmentum and extends up to cerebral aqueduct. D

29 Anterior part (cerebral crus, basis pedunculi).

Part anterior (crus cerebri). It consists of the previously mentioned cerebral crura. D

30 Part posterior. Posterior part of cerebral peduncle or tegmentum. See p. 292.10 D

31 Oculomotor sulcus. Sulcus oculomotorius. Furrow on the medial surface of the cerebral crus, exit site of the oculomotor nerve. D

32 Interpeduncular fossa. Fossa interpeduncu-laris. Fossa situated between the cerebral crura. D

33 Interpeduncular (posterior) perforated substance. Substantia perforata interpeduncularis [posterior]. Perforated floor of interpeduncular fossa produced by openings for numerous vessels. D

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