Cerebellum Flashcards Preview

Neuroanatomy > Cerebellum > Flashcards

Flashcards in Cerebellum Deck (15):
1

Folia

Fine lines in cerebellum to increase SA

2

3 Peduncles

Superior Cerebellar - efferents to red nucleus, thalamus, etc (has to decussate)
Middle - afferents from pons/cortex, so very big
Inferior - afferents and efferents from vestibular nuclei

3

4 Somatotopic Areas of Cerebellum/Functions

Vermis - middle: proximal extremity and trunk muscles
Intermediate part - distal extremity muscles
Lateral part - motor planning for extremities
Flocculonodular lobe - long thing across: balance and vestibulo-ocular reflexes

4

3.2 Deep Cerebellar Nuclei (and what they receive from)

Dentate nucleus - lateral cerebellar cortex
Interposed nuclei (emboliform and globose nuclei) - intermediate
Fastigial nucleus - vermis and flocculonodular

5

3 Input Tracts to Cerebellum

Spinocerebellum
Cerebrocerebellum
Vestibulocerebellum

6

Spinocerebellum pathway

Does muscles, as well as ipsilateral spinal cord proprioceptive input from inf cerebellar peduncle and double decussated spinal cord proprio via interneurons from sup cerebellar peduncle

7

Cerebrocerebellum pathway

To plan and regulate complex movements, takes contralateral cerebral cortex input via corticopontocerebellar tract

8

Corticopontocerebellar tract

Corticopontine tract to pontine nuclei, decuss as pontocerebellar tract via middle cerebellar peduncle, go through purkinje axons to deep nuclei, then decuss again as dentatothalamic tract via superior cerebellar peduncle, then synapse to thalamocortical tract back to cortex. So decusses twice

9

Vestibulocerebellum

Involved in posture/balance via excitatory mossy fibers acting on cerebellar cortex and deep cerebellar nuclei

10

Climbing Fibers

Form feedback loop from inferior olive to cerebellum to red nucleus back to IO. Act on Purkinje cells and excitatory on deep cerebellar nuclei. Purkinje cell sends negative effects on DCN. DCN is output

11

3 Places DCN Project To (& function)

Red nucleus to inferior olive to cerebellum for feedback
Thalamus (VL) to cortex to coordinate motor
Vestibular nuclei to let it know what you're planning

12

2 Symptoms of Cerebellar Ataxia

Wide stance gait
Intention tremors

13

Dysdiadochokinesia

Inability to perform rapidly alternating movements

14

Nystagmus

Involuntary eye movement characterized by alternating smooth pursuit in one direction and saccadic movement in other

15

Chiari malformation

Cerebellum pushes through foramen magnum and compresses spinal cord, causing cysts to form (syringmyelina) and cuts off CSF causing hydrocephalus