Motor System Organization II MCQ Quiz | Neurophysiology

1. Which of the following is the primary function of the cerebellum in motor control?

2. The climbing fibers that synapse on Purkinje cells in the cerebellar cortex originate from which structure?

3. The output of the Purkinje cells of the cerebellar cortex is primarily:

4. A lesion in the vestibulocerebellum (flocculonodular lobe) would most likely result in:

5. The term ‘striatum’ in the context of the basal ganglia refers to which two structures?

6. The direct pathway of the basal ganglia has a net effect of:

7. Parkinson’s disease is primarily caused by the degeneration of dopaminergic neurons in which structure?

8. Huntington’s disease is characterized by hyperkinetic movements and is associated with the loss of neurons primarily in the:

9. A lesion of the subthalamic nucleus typically results in which of the following conditions?

10. The cerebrocerebellum is primarily involved in which motor function?

11. In the indirect pathway of the basal ganglia, which structure provides excitatory input to the Globus Pallidus Interna (GPi)?

12. Dysdiadochokinesia, a clinical sign of cerebellar dysfunction, refers to the inability to:

13. Which of the following is the main output nucleus of the basal ganglia, projecting to the thalamus?

14. Mossy fibers provide input to the cerebellum from various sources. They primarily synapse on which cells?

15. A patient presents with a ‘pill-rolling’ tremor that is most prominent at rest. This symptom is highly characteristic of:

16. The spinocerebellum (vermis and paravermal zones) is primarily concerned with:

17. Which is the largest of the deep cerebellar nuclei and is associated with the cerebrocerebellum?

18. Dopamine’s effect on the striatal medium spiny neurons is complex. It excites neurons in the direct pathway via D1 receptors and _______ neurons in the indirect pathway via D2 receptors.

19. ‘Cogwheel rigidity’ is a clinical sign resulting from a combination of rigidity and tremor. It is commonly observed in:

20. The primary input to the putamen of the basal ganglia comes from the:

21. The cerebellar peduncles connect the cerebellum to the brainstem. Which peduncle carries the main efferent (output) fibers from the cerebellum?

22. Which of the following neurotransmitters is used by the striatal neurons that project to the Globus Pallidus (both interna and externa)?

23. An intention tremor, which worsens as a target is approached, is a classic sign of a lesion in the:

24. In the pathophysiology of Huntington’s disease, the initial and most severe degeneration occurs in the striatal neurons of the:

25. The final common pathway for motor commands from the cortex, cerebellum, and basal ganglia to the muscles is through the: