Control of Movement 3 Flashcards
What is the vestibulocerebellum?
Flocculonodular node
What is the spinocerebellum?
Vermis
Intermediate part of hemisphere
What is the cerebrocerebellum?
Lateral part of hemisphere
What is the role of the flocconodular lobe?
Maintaining balance and posture
What is the role of the spinocerebellum?
Modulates axial and anti-gravity muscles as well as eye movements
What is the role of the cerebrocerebellum?
Motor planning - sequences and coordinates distal muscles
Name the cerebellar deep nuclei from lateral to medial
Dentate Emboliform Globose Fastigial
What is the interposed nucleus?
Emboliform and globose nucleus combined
Where does the fastigial nucleus send information to?
Medial descending systems involved in trunk and proximal muscles via reticular formation
Vestibular, tectum ad cranial nerve nuclei for control of head and eye movements
Where does the interposed nucleus send information?
Lateral descending systems involved in distal muscles via the spindles
Where does the dentate nucleus send information and what for?
Motor and premotor cotices for motor planning
Where in the cerebellum is information from the vestibular nucleus passed for processing?
Flocculonodular lobe
Where are motor corrections sent to from the vestibulocerebellum?
Fastigial nucleus –> Vestibular nuclei & medullary reticulum (inhibitory)
Describe flocculonodular lobe syndrome
Not common
Seen in children with medulloblastoma
Characterised by truncal ataxia - wide based stance, swinging
Which type of information arrives at the spinocerebellum and via which tracts?
Proprioceptive via spinocerebellar and cuneocerebellar tracts
Motor intention via motor cortex
Where are corrective signals sent from the cerebellum?
Cerebra, red nucleus, vestibular nuclei (via thalamus)
Describe anterior lobe syndrome (spinocerebellum)
Overshoot (cerebellar drift)
Intention tremor
Lack of movement dampening
What type of information leaves the cerebrocerebellum and via which structures?
Info concerning order and timing of movements via dentate nucleus to cerebral cortex
Which side are cerebellar lesion signs on and why?
Ipsilateral
Output is contralateral but then crosses back at pyramids
Describe medial and lateral cerebellar lesions
Medial - truncal ataxia, nystagmus
Lateral - limb ataxia
Which side are signs from a vermis lesion?
Bilateral for trunk and proximal muscles (bilateral innervation)
Symptoms of a vermus lesion
Wide stance, unsteady
Slow and slurred speech
Symptoms of cerebrocerebellum lesion
Delay in initiation of movement
Loss of complex motor skills i.e. multi-joint movements
Symptoms of intermediate lobe
Limb ataxia
Action tremor
