Function of Cerebellum-Basal Ganglia Flashcards Preview

MS2 - Nervous System > Function of Cerebellum-Basal Ganglia > Flashcards

Flashcards in Function of Cerebellum-Basal Ganglia Deck (17):
1

What does the prism-adaptation experiment demonstrate?

The ability of the cerebellum to accommodate to unexpected motor-control outcomes

2

What fibers do gamma motor neurons innervate?

Intrafusal spindle fibers

3

Dopamine from the substantia nigra stimulates __________ in the ____________ in response to disappointment (when the outcome does not match your prediction).

reconnections; striatum

(this is the nigrostriatal pathway)

4

Lesions of the cerebellar vermis produce what symptoms?

Discoordination of the trunk, posture, and gait

5

Lateral lesions of the cerebellum lead to ___________.

discoordination of the ipsilateral arm

6

Both basal ganglia disorders and cerebellar disorders present with tremor, but there is a key difference. What is it?

Cerebellar tremors occur with action, while basal ganglia tremors occur at rest

7

Hypermetria and hypometria are ______________.

overshooting or undershooting an aimed-at target

8

What gait characterizes Parkinson's?

A stooped gait with small, shuffling steps

9

What parts of the brain send information to the inferior olivary nucleus?

The parietal lobes. If the visual and proprioceptive information is what the brain expects, then the ION will not be stimulated. It will be stimulated if there is an unexpected result.

10

What pathway mediates the reward system?

The striosome projects to the substantia nigra / VTA and conveys the current state of the cortex. In response to unexpected reward, the striosome stimulates the SN/VTA and causes it to release dopamine, thus remembering the cortical state that produced that behavior.

11

Positive pronator drift can indicate three possible disorders: ________________.

ipsilateral cerebellar disorders
contralateral parietal disorders
contralateral pyramidal tract disorders

12

Saying "LaPaKa" tests which cranial nerves?

La: 12
Pa: 7
Ka: 10

13

Neuropathic gaits are characterized by weak ____________.

dorsiflexion

14

Ataxic gaits are characterized by ____________.

wide, staggering, and clumsy

15

Slamming the foot down is characteristic of what type of gait?

Sensory gaits

16

A key point of cerebellar damages is that small lesions ___________.

have almost no effect; lesions of the SCP of DCN, however, have a huge effect

17

What is paratonia?

When the patient actively opposes any passive movement, despite instructions to relax

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