Cerebellum Flashcards by Chavez Girls

what happens when there is severe damage to. the cerebellum?

it does NOT cause weakness because there are no direct connections between the cerebellum and motor neurons
- causes coordination and postural control deficits

How well did you know this?

Not at all

Perfectly

anterior lobe functon

coordination of PROXIMAL limbs

How well did you know this?

Not at all

Perfectly

posterior lobe function

coordination of DISTAL limbs

How well did you know this?

Not at all

Perfectly

flocculonodular lobe function

balance and eye movements

How well did you know this?

Not at all

Perfectly

cerebrocerebellum

-motor planning (UE/LE)
-lateral hemisphere
-dentate nucleus

MID

How well did you know this?

Not at all

Perfectly

cerebrocerebellum input

motor/premotor cortex
pontine nuclei
cross #1: MIDDLE peduncle
contralateral lateral cerebellum

How well did you know this?

Not at all

Perfectly

cerebrocerebellum output

contralateral lateral cerebellum
dentate nucleus
cross #2: SUPERIOR peduncle
thalamus
motor cortex
L. CST/ Rubrospinal: DISTAL mvmts

How well did you know this?

Not at all

Perfectly

spinocerebellum

-nonconscious proprioception
-vermis/intermediate hemisphere
-fastigal nucleus, interposed nucleus

NVFI: No Veggies, Fries Instead

How well did you know this?

Not at all

Perfectly

vermis function

PROXIMAL movements

How well did you know this?

Not at all

Perfectly

intermediate hemisphere function

DISTAL vol movement

How well did you know this?

Not at all

Perfectly

spinocerebellum tracts

Dorsal spinocerebellar
cuneospinocerebellar
ventral spinocerebellar
rostral spinocerebellar

How well did you know this?

Not at all

Perfectly

Dorsal Spinocerebellar tract

function: unconscious proprioception LE

1st order: type Ia (muscle spindles) in LE –> clarks nucleus

2nd order: clark’s nucleus –> INFERIOR peduncles

UNCROSSED

How well did you know this?

Not at all

Perfectly

Cuneocerebellar tract

function: unconscious proprioception of face, neck UE

1st order: type Ia fibers (muscle spindles) –> lateral cuneate medulla

2nd order: lateral cuneate –> INFERIOR peduncles

UNCROSSED

How well did you know this?

Not at all

Perfectly

ventral spinocerebellar tract

function: unconscious proprioception LE (reflexes)

1st order: LE type Ib fibers (GTOs) –> DRG

2nd order: DRG –> SUPERIOR peduncle

DOUBLE CROSS
- @ SC level
- cerebellum

How well did you know this?

Not at all

Perfectly

rostral spinocerebellar tract

function: unconscious proprioception from UE (reflexes)

1st order: UE type Ib fibers (GTOs) –> dorsal horn

2nd order: dorsal horn –> INFERIOR AND SUPERIOR peduncles

UNCROSSED

How well did you know this?

Not at all

Perfectly

Spinocerebellum outputs

via vermis and intermediate zone

How well did you know this?

Not at all

Perfectly

vestibulocerebellum

-balance and eye movements
-flocculonodular lobe
-vestibular nuclei

How well did you know this?

Not at all

Perfectly

Vestibulocerebellar tract input/afferents

vestibular nerve –> vestibular nuclei
–> flocculonodular lobe

How well did you know this?

Not at all

Perfectly

vestibulocerebellar tract output/efferents

flocculonodular lobe –> vestibular nuclei –> L/M vestibulospinal tracts

How well did you know this?

Not at all

Perfectly

M vs. L vestibulospinal tract function

m: neck muscles (crosses)
l: extensor muscles (uncrossed)

How well did you know this?

Not at all

Perfectly

homunculus: midline vermis

trunk –> truncal/gait instability

homunculus: intermediate hemispheres

appendicular muscles–>limb ataxia

superior cerebellar peduncle

-mostly efferents (sending info OUT)
-cerebellum –> midbrain

middle cerebellar peduncle

-mostly afferents (info coming in)
-pons/superior colliculi –> cerebellum

inferior cerebellar peduncle

-afferents: inferior olivary nucleus --> cerebellum -efferents: cerebellum --> vestibulospinal and reticulospinal tracts

dentate nucleus

-receives from lateral hemisphere anticipatory movements

interposed nuclei

-emboliform and globose - receives from intermediate hemisphere --> DISTAL limb

fastigal nuclei

-receives from vermis and flocculonodular lobe -balance, trunk posture, head movements

3 layers of cortical gray matter of cerebellum

granular purkinje molecular

granular layer associated cells

Golgi cell granule cell

Golgi cell

inhibitory interneuron

granular cell

excitatory interneuron: excites purkinje cells

purkinje layer cells

purkinje cell

output cell that INHIBITS deep cerebellar nuclei

molecular layer cells

stellate basket

stellate/basket cells

inhibitory interneuron: inhibits purkinje fibers

Mossy fibers

transmit afferent info (sensory pathways) from SC and pons through excitatory neurotransmitters to cerebellum

climbing fibers

transmit afferent info (movement errors) from inferior olivary nucleus to cerebellum

what is the effect of mossy fibers exciting granular cells?

increased movement

what is the effect of mossy fibers exciting Golgi cells?

decreased movement

Superior cerebellar artery

parent: basilar supplies: superior/middle peduncles

anterior inferior cerebellar artery

parent: basilar supplies: - middle peduncle - anterior/inferior cerebellum (flocculus)

posterior inferior cerebellar artery

parent: vertebral supplies: -tonsils -inferior vermis -inferior peduncle

Lesion to any part of the cerebellum results in

ataxia

Lesions to the vestibulocerebellum result in

Nystagmus unsteadiness truncal ataxia disequilibrium

Lesions to the cerebrocerebellum result in

ataxic finger movements dysarthria - slurring of speech

If tone is abnormal with cerebellar lesions, will it present as hyper or hypotonia?

hypotonia due to decreased muscle spindle activity

Lesions to the spinocerebellum result in

dysarthria scanning speech dysdiadokinesia dysmetria action tremor intention tremor loss of check/rebound movement decomposition

movement decomposition

attempting to move 1 joint at a time -. Instead of fluid motion, the movement becomes jerky, segmented, or clumsy