Cerebellum, corticopsinal tract and motor system

Question 1

What does the cerebellum do?

Answer 1

• Controls the rate, timing and force of movement (voluntary?)
• Tone of muscles
• coordinates the muscles of equilibrium

Question 2

What are the parts of the cerebellum and order they came about?

Functions

Answer 2

Archicerebellum, in diagram bottom: balance
Palaeocerebellum, medial part : muscle tone
Neocerebellum, lateral : control of precise rate timing and force

Question 3

What are the inputs to the different parts of the cerebellum?

Answer 3

Archicerebellum: vestibular system (vestibulocerebellar fibres)
Palaeocerebellum: muscle spindles (DSCT) and golgi tendon organs/proprioreceptors (VSCT) ( spinocerebellar fibres)
Neocerebellum: cerebral cortex -> pontine nuclei (pontocerebellar fibres)

Question 4

Cerebellar

note what type of output is cerebellar? (inhibitory/excitatory)

Answer 4

Archicerebellum: Out to Lat Vestibular nucleus and then to LMNS
Palaeocerebellum: goes to certain nuclei which take information to LMN’s (reticulospinal path)
Neocerebellum: nuclei to thalamus (GLUTAMATE. excitatory), then to UMN area 4 and 6 to then LMN.

Question 5

Cerebellar disease

Answer 5

ATAXIA- uncoordinated movements

loss of balance

Question 6

Disease of UMN and LMN

Answer 6

UMN- Spastic paralysis

LMN- Flaccid paralysis

Question 7

Note on corticospinal and bulbar tracts.

Answer 7

DRAW