Medulla

Question 1

Role of the cerebellum in motor control

Answer 1

a. coordinates movement
b. regulates and maintains muscle tone
c. equilibrium and balance

Question 2

Cerebellum receives and processes unconscious proprioceptive info regarding what?
How does it enter as well.

Answer 2

1) vestibular system (vestibulocerebellar pathway), ENTERS VIA inferior peduncles

2) muscle spindles (re: muscle length) and Golgi tendon organs (re: muscle tension), joint receptors (spinocerebellar pathways) ENTERS VIA Superior and Inferior peduncles

Question 3

For motor control does the cerebellum receive auditory/ visual and sennsory systems?

Answer 3

yes they receive all above and info regarding the motor commands/plans via input from cortical areas BA 4 and 6 via the

1) corticopontocerebellar pathway, ENTERS VAI middle peduncle

Question 4

Where do plans from area 4 and 6 enter in the cerebellum

Answer 4

ENTERS VAI middle peduncle

Question 5

Does cerebellum initiate movement?

Answer 5

No, Cortex does.

Question 6

What is the cerebellum involved with?

Answer 6

a. timing of motor movements
b. progression of movements
c. coordinates agonist and antagonist muscles
d. helps to sequence movements
e. monitors body status and makes corrective adjustments in motor activities

Question 7

Cerebellum cell layers Purkinje

Answer 7

Middle project to deep nuclei
modualte activity of deep nuclei
release inhibitory

Question 8

Granule cells

Answer 8

Are excitatory , most numerous

Question 9

Cerebellar lobe anterior

Answer 9

regulates muscle tone via input from spine, receives proprioceptive info and GDS info and plays a role in posture and equilibrium

Question 10

Cerebellar lobe middle

Answer 10

role in motor coordination, planning and programming, has reciprocal connections with motor and sensory cortices

Question 11

Flocculonodular

Answer 11

regulation of muscle tone, posture, equilibrium, and coordination of eye movements

Question 12

Cerebellar zone median vermal

Answer 12

movements of axial body, fastigial nucleus, homunculus for axial body

Question 13

Cerebellar zoneIntermediate

Answer 13

control of muscle contractions in distal limbs, influences lateral CS tract, interposed and emboliform nuclei, homunculus for limbs and face

Question 14

Cerebellar zone Lateral

Answer 14

coordination of sequential movements and learning of complex sequential movements, influences lateral CP tract, dentate nucleus

Question 15

A disruption in the timing of cerebellar inhibition and excitation will result in

Answer 15

a disruption in movement

Question 16

The cerebellum is involved with the synergy of rapid alternating movements and fine coordination of the muscles for speech.

Answer 16

True

Question 17

Both the lateral and intermediate zones influence the lateral cortical spinal tract.

Answer 17

True

Question 18

The flocculonodule lobe plays a role in

Answer 18

coordination of eye movements

Question 19

Ataxic dysarthria results in

Answer 19

slurred speech
reduced intelligibility
irregular articulatory breakdowns

Question 20

Cerebellar output must first travel through the__________________before traveling to areas 4 and 6 in the motor cortex.

Answer 20

VL nucleus of thalamus

Question 21

Cerebellar output is via the deep nuclei.

Answer 21

True

Question 22

Climbing fibers originate in the ___________and are __________to ____________________cells.

Answer 22

pons ; inhibitory ; Purkinje
medulla ; excitatory ; Purkinje

Question 23

Mossy fibers from the cerebrum, spine, and brain stem enter the cerebellum and (choose all that apply)

Answer 23

excite the deep nuclei
excite the granule cells

Question 24

What percentage of cerebellar cortex can be seen from the outside of the cerebellar surface?

Answer 24

15%

Question 25

Granular cells are inhibitory to the Purkinje cells .

Answer 25

False

Question 26

The Purkinje cells are found in the _____of the cerebellum and are ________to the deep cerebellar nuclei.

Answer 26

cortex; inhibitory

Question 27

The lateral zones of the cerebellum are believed to have a role in the coordination of sequential movements.

Answer 27

True

Question 28

The intermediate zone of the cerebellum includes the

Answer 28

Globus and emboliform nuclei

Question 29

The functions of the cerebellum include all expect

Answer 29

Initiation of movement

Question 30

The cerebellar vermal zone includes the _____________nucleus and has a role in movements of the ___________.

Answer 30

Fastigial ; axial body

Question 31

The anterior lobe of the cerebellum is involved with

Answer 31

Regulation of muscle tone