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1 Tegmen of fourth ventricle. Tegmen ventriculi quarti. Roof of 4th ventricle. A

2 Superior medullary velum. Velum medullare superius. Lamina of white matter spread out between the right and left superior cerebellar peduncles. It is fused with the lingula of the cerebellum. A

3 Frenulum of superior medullary velum. Frenulum veli medullaris superioris. Band-like ridge from the superior medullary velum to the tectal lamina. A

4 Inferior medullary velum. Velum medullare in-ferius. Plate of white matter in the upper part of the lower roof of the rhomboid fossa. It is fused with the peduncle of the flocculus and the nodulus of the cerebellum. A

5 Tela choroidea of fourth ventricle [ventriculi quarti]. Clear pia mater carrying the choroid plexus and stretched between the inferior medullary velum and tenia of the fourth ventricle. A

6 Choroid plexus of fourth ventricle. Plexus choroideus [ventriculi quarti]. Paired, garlandlike ependyma-covered, highly vascularized tufted projection which extends into the two lateral apertures. A

7 Tenia of fourth ventricle. Taenia [ventriculi quarti]. Ridge on lower portion of roof of rhomboid fossa. A

8 Obex. Small bridge at lower end of rhomboid fossa. A

9 Median aperture of fourth ventricle [foramen of Magendie]. Apertura mediana [ventriculi quarti] [Magendie]. Unpaired opening directly above the obex for passage of cerebrospinal fluid. A

10 Lateral aperture of fourth ventricle [foramen of Luschka]. Apertura lateralis [ventriculi quarti] [[Luschkae]]. Opening for passage of cerebrospi-nal fluid located at the end of the right and left lateral recesses. A

11 CEREBELLUM. It is located above the rhomboid fossa.

12 Folia of cerebellum. Folia cerebelli. Delicate cere-bellar convolutions (gyri) separated by fissures. B

13 Cerebellar fissure. Fissura cerebelli. Deeply branched furrow located between two cerebellar folia. B

14 Vallecula. Deep median groove located inferiorly between the right and left halves of the cerebellum. It lodges the medulla oblongata. C

15 Body of cerebellum. Corpus cerebelli. Entire cerebellum except for the flocculonodular lobe.

16 Vermis of cerebellum. Vermis cerebelli. Phylo-genetically older, unpaired segment of the cerebellum. B

17 Cerebellar hemisphere. Hemisphaerium cere-belli. Either of the two halves of the cerebellum. C

18 Anterior lobe of cerebellum. Lobus anterior cerebelli. Region cranial to primary fissure. B D

19 Lingula. Unpaired part of vermis fused with the superior medullary velum. It belongs to the ar-cheocerebellum. C D

20 Central lobule. Lobulus centralis. It lies over the lingula and is continuous on both sides with the ala of the central lobule. C D

21 Culmen. Segment of vermis between the central lobule and primary fissure. B C D

22 Ala of central lobule. Ala lobuli centralis. Lateral extension of central lobule for connection with the cerebellar hemispheres. B C D

23 Quadrangular lobule. Lobulus quadrangularis (pars anterior). Part attaching laterally to the declive. B C D

24 Primary fissure. Fissura prima. Identation between the quadrangular and simplex lobules. B D

25 Posterior lobe of cerebellum. Lobus posterior cerebelli. Region located between the primary and dorsolateral fissures. D

26 Declive. Part ofvermis declining posteriorly from the culmen. B D

27 Folium of vermis. Narrow midline connection between the left and right superior semilunar lobules. B D

28 Tuber of vermis. Median connection between the right and left inferior semilunar lobules. B C D

29 Pyramid of vermis. Pyramis vermis. Segment situated between the right and left biventral lobules. C D

30 Secondary (postpyramidal) fissure. Fissura secunda. Fissure between the pyramid and uvula of the vermis. C D

31 Uvula vermis. Part of the vermis lying between the cerebellar tonsils. C D

32 Lobulus simplex (lobulus quadrangularis) (pars inferoposterior). Portion located between the quadrangular and superior semilunar lobules. B C D

33 Superior semilunar lobule. Lobulus semilunaris superior. Part situated between the inferior semilunar lobule and lobulus simplex. B C D

34 Horizontal fissure. Fissura horizontalis. Deep groove between the superior and caudal semilunar lobules. B C D

35 Inferior semilunar lobule. Lobulus semilunaris inferior. Part of the cerebellum located between the superior semilunar and biventral lobules. B C D

36 Gracile (paramedian lobule). Lobulus gracilis (l. paramedianus). It is located between the caudal semilunar and biventral lobules. D

37 Biventral lobule. Lobulus biventer. It lies between the paramedian lobule and cerebellar tonsil. C D

38 Tonsil of cerebellum. Tonsilla cerebelli. Small bean-shaped portion of the hemisphere lateral to the uvula. C D

39 Posterolateral fissure. Fissura posterolateralis. Furrow separating the nodulus and flocculus on one side and the cerebellar tonsil and biventral lobe on the other. C D

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