Cerebellum Flashcards
3 pathways of unconscious proprioception
- posterior spinocerebellar tract
- anterior spinocerebellar tract
- cuneocerebellar tract
Posterior spinocerebellar tract
- proprioception trunk and LE
- origin: Olivary nucleus
- enters cerebellum through inferior cerebellar peduncle
Anterior spinocerebellar tract
- T12-L5
- spinal border cells
- enters cerebellum through superior cerebellar peduncle
Cuneocerebellar Tract
- double crossing tract
- origin: lateral cuneate nucleus in medulla
- enters cerebellum via inferior cerebellar peduncle
How does unconscious proprioception project in the cerebellum?
Ipsilaterally
What should I know about Mossy fibers and perkiness cells?
Mossy fibers excite inhibitory perkinje cells which then inhibit deep cerebellar nuclei
Climbing fibers
- From contralateral inferior olivary nucleus
- travel through inferior cerebellar peduncle
- terminate on Purkinje cells
- carry training information that a movement is occurring or the plan
Mossy fibers
- terminate on granular cells
- can enter through middle or inferior cerebellar peduncle
- carry state information (of muscles and world)
Vestibulocerebellum
Flocculonodular lobe + fastigial node
Equilibrium/balance/eye movement
Spinocerebellum
Axial muscles: vermis + fastigial nucleus
Distal muscles: paravermis + globose/emboliform nucleus
Allows for coordination and mid-course corrections
Lesions of vermal spinocerebellum
Can cause gait disturbances/ wide-based and unsteady gait/ataxia
Lesions of paravermal spinocerebellum
Ataxia
Abnormal coordination of voluntary movements
Dysmetria
Cerebrocerebellum
Lateral hemispheres + dendate nucleus
Allows for cerebellar participation in programming and planning motor movements
Mental imaging, mental rehearsal
Cortico-ponto cerebellar cortex
To inform of motor plan
Cortico-olive-cerebellar fibers
Motor learning
