Cerebellum Flashcards

Examine cerebellar anatomy, including its lobes, cortex, deep nuclei, cerebellar peduncles, neural connections, and motor functions.

Card 1 of 30Question

Where is the cerebellum located?

In the posterior cranial fossa, posterior to the pons and medulla oblongata and inferior to the occipital lobes.

In This Section

1. Where is the cerebellum located?

In the posterior cranial fossa, posterior to the pons and medulla oblongata and inferior to the occipital lobes.

2. Which dural fold separates the cerebellum from the occipital lobes?

The tentorium cerebelli.

3. What are the three principal anatomical divisions of the cerebellum?

The two cerebellar hemispheres and the midline vermis.

4. What is the vermis of the cerebellum?

The narrow median region connecting the two cerebellar hemispheres.

5. What are the three anatomical lobes of the cerebellum?

The anterior lobe, posterior lobe, and flocculonodular lobe.

6. Which fissure separates the anterior and posterior cerebellar lobes?

The primary fissure.

7. Which fissure separates the flocculonodular lobe from the posterior lobe?

The posterolateral fissure.

8. Which structures form the flocculonodular lobe?

The midline nodulus and the paired flocculi.

9. What are cerebellar folia?

Narrow, leaf-like folds of the cerebellar cortex separated by fissures.

10. What is the arbor vitae?

The branching pattern of cerebellar white matter visible in a sagittal section.

11. What are the three layers of the cerebellar cortex from superficial to deep?

The molecular layer, Purkinje cell layer, and granular layer.

12. Which neurons form the principal output of the cerebellar cortex?

Purkinje cells.

13. Which neurotransmitter is released by Purkinje cells?

Gamma-aminobutyric acid (GABA), producing inhibitory effects on their targets.

14. Which neurons are the most numerous in the cerebellar cortex?

Granule cells, located primarily in the granular layer.

15. What are the two principal types of excitatory afferent fibers entering the cerebellar cortex?

Mossy fibers and climbing fibers.

16. From which nucleus do cerebellar climbing fibers originate?

The contralateral inferior olivary nucleus in the medulla oblongata.

17. What are the four paired deep cerebellar nuclei?

Dentate, emboliform, globose, and fastigial nuclei.

18. Which deep cerebellar nuclei together form the interposed nuclei?

The emboliform and globose nuclei.

19. Which deep cerebellar nucleus is the largest and most lateral?

The dentate nucleus.

20. Which deep cerebellar nucleus is primarily associated with the vermis?

The fastigial nucleus.

21. What are the three paired cerebellar peduncles?

The superior, middle, and inferior cerebellar peduncles.

22. Which cerebellar peduncle carries most efferent fibers from the deep cerebellar nuclei?

The superior cerebellar peduncle.

23. Which cerebellar peduncle carries pontocerebellar fibers into the cerebellum?

The middle cerebellar peduncle.

24. Which cerebellar peduncle carries dorsal spinocerebellar and olivocerebellar fibers?

The inferior cerebellar peduncle.

25. What are the three principal functional divisions of the cerebellum?

The vestibulocerebellum, spinocerebellum, and cerebrocerebellum.

26. What is the principal function of the vestibulocerebellum?

Maintaining balance and coordinating eye movements.

27. What is the principal function of the spinocerebellum?

Regulating posture, muscle tone, and the execution of ongoing movements.

28. What is the principal function of the cerebrocerebellum?

Planning and refining skilled voluntary movements and contributing to motor learning.

29. Which three major arteries supply the cerebellum?

The superior cerebellar, anterior inferior cerebellar, and posterior inferior cerebellar arteries.

30. What are characteristic clinical signs of cerebellar damage?

Ataxia, dysmetria, intention tremor, dysdiadochokinesia, and sometimes nystagmus.