Flashcards in Function of Cerebellum-Basal Ganglia Deck (17):
What does the prism-adaptation experiment demonstrate?
The ability of the cerebellum to accommodate to unexpected motor-control outcomes
What fibers do gamma motor neurons innervate?
Intrafusal spindle fibers
Dopamine from the substantia nigra stimulates __________ in the ____________ in response to disappointment (when the outcome does not match your prediction).
(this is the nigrostriatal pathway)
Lesions of the cerebellar vermis produce what symptoms?
Discoordination of the trunk, posture, and gait
Lateral lesions of the cerebellum lead to ___________.
discoordination of the ipsilateral arm
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
Hypermetria and hypometria are ______________.
overshooting or undershooting an aimed-at target
What gait characterizes Parkinson's?
A stooped gait with small, shuffling steps
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.
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.
Positive pronator drift can indicate three possible disorders: ________________.
ipsilateral cerebellar disorders
contralateral parietal disorders
contralateral pyramidal tract disorders
Saying "LaPaKa" tests which cranial nerves?
Neuropathic gaits are characterized by weak ____________.
Ataxic gaits are characterized by ____________.
wide, staggering, and clumsy
Slamming the foot down is characteristic of what type of gait?
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