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Flashcards in Cerebellum Deck (14)
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1

Cerebellum

The sober "little brain"
Primary function to evaluate how well movements initiated by the cerebrum are carried out (coordination of skilled movements).
Feedback signals correct errors, smooth movements, coordinate complex motor sequences.
10% of brain mass, over half of the neurons

2

What separates the cerebellum from the cerebrum?

Transverse fissure
Tentorium cerebelli

3

Vermis

The "worm" portion of the cerebellar butterfly

4

Lobes of the cerebellulm

The "wings'
Anterior lobes
Posterior lobes
Flocculonodular lobes

5

Anterior lobe of the cerebellum

Involved in unconscious proprioception (spinothalamic tract)

6

Posterior lobe of the cerebellum

Involved in the fine tuning of movement associated with subconscious movement.

7

Flocculonodular lobe

Cerebellum
Involved in equilibrium and balance (specifically with eyes)

8

Cerebellar cortex

Bulk of cerebellar mass
Superficial layer
Grey matter in a series of parallel folds (folia)

9

Layers of the cerebelllum

Cerebellar cortex (grey matter)
Arbor vitae (white matter)
Cerebellar nuclei (grey matter that give rise to axons carrying impulses from the cerebellum to the other brain centres)

10

Cerebellar Peduncles

Bundles of white matter that attach cerebellum to brain stem
3 pairs: superior, middle and inferior

11

Superior penduncles

Cerebellum
Connect cerebellum to red nuclei (midbrain) and thalamus

12

Middle peduncles

Cerebellum
Largest peduncles
Axons carry impulses for voluntary movements from pontine nuclei (which received input from motor cortex) into cerebellum

13

Inferior peduncles

Cerebellum
Five tracts:
1. spinocerebellar (from proprioceptors of limbs and trunk)
2. from vestibular apparatus of inner ear and vestibular nuclei of medulla and pons(from sensory receptors of head)
3. from inferior olivary nucleus (regular cerebellar neurons)
4. cerebellum to vestibular nuclei of medulla and pons
5. cerebellum to reticular formation

14

Ataxia

Inability to coordinate movements
Often the result of damage to the cerebellum