Cerebellum

Question 0

Areas of the cerebellum

Answer 0

-vestibulocerebellum
-spinocerebellum
-cerebrocerebellum
Associated nuclei:
Fastigial nuclei
Dentate nuclei
Interposed nuclei

Question 1

Primary function of cerebellum

Answer 1

-motor learning, integrating sensory information, cognition and modulating motor output (fine tuning)

Question 2

Input & output

Answer 2

• input and output via the peduncles (inf, med, sup)

- only output via the PERKINJE cells-inhibitory …reduces descending output

Question 3

Vestibulocerebellum

Answer 3

Function: VOR, balance , posture
Subdivisions: floccus, nodulus
Input: vestibular input directly from 8th cranial nerve…vestibulocochlear
Output: back to vestibular nuclei
Deficits: balance, posture and eye movement

Question 4

Spinocerebellum

Answer 4

Function: sensory integration, (efferent copy) and gain of descending outputs for multi joint movements and dynamic stability
Subdivision-intermediate zone and vermis-somatotopically organized
Input :somatosensory info from periphery , visual and vestibular info
Output :M1 areas via the thalamus
Deficits: smooth control of muscles and gain of muscle tone, uncertain starts and stops, and unequal steps

Question 5

Cerebrocerebellum

Answer 5

Function: visually guided and goal directed movements
Subdivisions: none
Input :m1 , promotor cortex frontal and posterior parietal lobes
Output: thalamus, circuit with motor areas
Deficits: visually guided movements ,dysdiadochonkinesia(slap hand to face after force is removed), dysmentria (can’t put finger to nose)

Question 6

Deficits In cerebellum

Answer 6

-wide base of support…ataxic gate (very unstable )

Question 7

How the cerebellum is involved in voluntary movement

Answer 7

FEEDBACK (for slow movements) -the desired output is compared continuously with the actual output (efferent copy)
Pro-accurate output, con-slow
FEEDBACK: for rapid movements. Sensory feedback is evaluated before the output program is generated.
-adapts with experience

Question 8

Alcohol and cerebellum

Answer 8

Alcohol can cause LTD in your cerebellum …results In ataxic gate

Question 9

Cerebellum vs. Basal ganglia

Answer 9

Basal ganglia: involved in planning and gain of complex movements
Cerebellum:is concerned with the coordination of ongoing movements (but also involved in planning-FEEDFORWARD and feedback )