PT9111 - Cerebellum Flashcards
Where does the cerebellum receive input from? What pathway?
Cortex via the pons (motor plan; intended movement)
Corticopontocerebellar pathway
Where does the cerebellum receive position sense information? What pathway?
Peripheries (what movement actually happened).
Spinocerebellar pathways
What tract is used for the cerebellum to send information (movement correction)?
Cerebellothalamocortical
Where does the corticopontocerebellar pathway run?
Cortex, pons, middle cerebellar peduncle, purkinje fibers, deep cerebellar nuclei
What are the three deep cerebellar nuclei (from medial to lateral)?
Fastigial nuclei, interposed nuclei, dentate nucleus
What does the fastigial nuclei output?
head, trunk, proximal limb movements, posture, gait, eye movements
What do the interposed and dentate nucleus output?
Progressively more distal limb movements ipsilaterally; multi-joint limb movements
Does the deep cerebellar nuclei have ipsilateral or contralateral somatotopy?
Ipsilateral
What information is relayed via the spinocerebellar pathway?
Non-conscious proprioception
Where are the cell bodies for 1st order neurons in the spinocerebellar pathways?
Dorsal root ganglion
Is there a 3rd order neuron in the spinocerebellar pathways?
No.
What are the spinocerebellar pathways? Which ones are crossed?
LE: dorsal (uncrossed) and ventral (crossed) spinocerebellar
UE: Cuneocerebellar (uncrossed) and rostral (uncrossed) spinocerebellar
What does the cerebellum do?
Compares motor plan to movement that occurred
What do cerebellar lesions impact?
Motor learning, ability to produce selective and coordinated movement (includes speech, language, and working memory)
How do cerebellar lesions present clinically?
Normal strength, normal conscious proprioception, ABNORMAL movement