Cerebellum Flashcards
1
Q
What is the role of the basal ganglia in the context of movement
A
- Receives input from widespread cortical areas, integrates this input and projects it back to the cortex
- Encodes the decision to move, the direction and amplitude of movement and the motor expression of emotions
2
Q
What connects the cerebellum to the medulla?
A
Inferior peduncles
3
Q
What connects the cerebellum to the pons?
A
Middle peduncles
4
Q
What connects the cerebellum to the midbrain?
A
Superior peduncles
5
Q
Excitatory fibres of the cerebellum
A
- Mossey fibres
* Climbing fibres
6
Q
What are the layers of the cerebellum?
A
- Molecular layer - parallel fibres, axons, sensory info
- Purkinje cell - all in a straight line
- Granule cell layer: granular cells, glomeruls, Golgi cells
7
Q
Inhibitory fibres of the cerebellum
A
- Golgi
* Purkinje
8
Q
Input of the cerebellum
A
- Inputs from the climbing fibres come up and synapse with the parallel fibres.
- Mossey fibres brings sensory info and synapse on parallel fibres
- Purkinje and Golgi are inhibitory
- Spinocerebellar tracts
9
Q
Which cell mediates learned movements
A
Purkinje
10
Q
What sends signals to the red nucleus?
A
- Deep cerebellar nuclei
* via rubrospinal tract
11
Q
What are the deep cerebellar nuclei?
A
- Dentate
- Emboliform
- Globose
- Fastigial
12
Q
What makes up the interposed nucleus?
A
- Emboliform
* Globose
13
Q
What are the roles of the cerebellum?
A
- Acts as a comparator
- Acts as a timing device
- Initiates and stores movements
- modulate motor output
14
Q
Cerebellum as a comparator
A
- Compares descending supra spinal motor signals with ascending afferent feedback information
- So movement is smoothly and accurately coordinated
15
Q
Cerebellum as a timing device
A
- Pontocerebellum - Creates a sequence for motor activation
- Vestibulocerebellum - maintains balance
- Spinocerebellum - maintains posture
