17 Cerebellum Flashcards
What is the function of the cerebellum? (3).
Production of co-ordinated movement.
Co-ordinates time, force and duration of muscle action.
Involved in maintaining balance and posture.
What are the three functional subdivisions of the cerebellum?
Archi/vestibulocerebellum.
Paleo/spinocerebellum.
Neo/cerebrocerebellum.
What does the archi/vestibulocerebellum consist of?
Flocculonodular lobe and part of vermis.
What does the paleo/spinocerebellum consist of?
Vermis and adjacent region of hemispheres.
What does the neo/cerebrocerebellum consist of?
Lateral part of the hemispheres.
What does the vestibulocerebellum control?
Co-ordinates balance and constancy of visual fields.
What does the spinocerebellum control?
Muscles involved in posture and movement.
What does the cerebrocerebellum control?
Movements of distal limbs - particularly the fine movements of the hands.
Describe the connections of the vestibulocerebellar lobe:
VIII goes (±vestibular nucleus) through the ICP to the vestibulocerebellum. UMN to vestibular nucleus. LMN: III, IV, VI, neck and vestibulospinal tract.
Which side of the body does the right side of the cerebellum control?
Right, IPSILATERAL.
How does information get to the spinocerebellum?
Spinocerebellar tract carries ipsilateral proprioception information through the ICP.
Where does the cerebrocerebellum get information from? (2).
What does this info contain?
Pontine nuclei via MCP.
Inferior olivary nucleus through ICP.
Information about intended movements.
Where does the cerebellum give output to? (3).
Via what?
Motor cortex via thalamus. Reticular nuclei. Red nucleus.
SCP.
What does damage to the inferior olivary nucleus cause?
Defects in motor learning.
What is truncal ataxia?
Inability to sit or stand without falling over.