5.5 Disorders of the Cerebellum Flashcards
1
Q
What are the three functional divisions of the cerebellum? What areas do they correspond to, and what are their functions?
A
- Vestibulocerebellum (FN lobe). Important for maintaining balance and controlling eye movements.
- Spinocerebellum (anterior lobe, vermis, and medial posterior lobe). Important for muscle tone and skilled, voluntary movements.
- Cerebrocerebellum (lateral posterior lobe). Important for planning, timing and initiating voluntary movement.
2
Q
What is seen in cerebrocerebellum lesions?
A
- Variable delays in initiating movement
- Temporal irregularity, esp. with hand movement
3
Q
What is seen in spinocerebellum lesions?
A
- Decreased accuracy in reaching movements
- Poorly coordinated joint motion
4
Q
What is seen in vestibulocerebellum lesions?
A
- Balance problems
- Problems coordinating limb movements while standing
5
Q
Why are we unlikely to have unilateral deficits in response to a medical cerebellar lesion?
A
Because the contralateral medial musculature can compensate; this is not the case in the lateral thalamus
6
Q
List 5 distinctive signs of cerebellar disease
A
- Hypotonia
- Ataxia
- Intention tremor
- Cerebellar nystagmus
- Astasia-abasia
7
Q
Describe an intention tremor.
A
Not present at rest. Becomes more marked at end of movement
8
Q
What is astasia?
A
Inability to stand
9
Q
What is abasia?
A
Inability to walk
10
Q
A
