cerebellum

Question 1

describe the superior cerebellar peduncle

Answer 1

efferent pathway to red nucleus and cortex via the hypothalamus and superior colliculus

Question 2

Describe the inferior cerebellar peduncle

Answer 2

carries info to and from the spinal cord and proprioceptive info to and from the vestibular nuclei, infro about what is going on in the outside world goes through this tract

Question 3

describe the middle cerebellar peduncle

Answer 3

most fibres originate in the pons, the pons receives input from several sources, largest input from the cortex.

Question 4

give the anatomical subdivisions of the cerebellum

Answer 4

anterior lobe posterior lobe, floccculonodular lobe and primary and posterio fissures

Question 5

give the functional subdivisions of the cerebellum

Answer 5

flocculonodular lobe, the central vermis intermediate and lateral zones

Question 6

give the divisions of the CB by input

Answer 6

Vestibulocerebellum
Spinocerebellum
Cerebrocerebellum

Question 7

explain the vestibulocerebellum

Answer 7

floculonodular lobe. imput directly from the primary vestibular afferents, output to the vestibular nucleus. controls eye movement, balance and posture

Question 8

explain the spinocerebellum

Answer 8

the vermis: receives visual, auditory, vestibular and somatic info from the head and proximal musculatuer. projects via the fastigial nucleus to cortical and brain stem regions. controls posture, locomotion eye movement and gaze.
the intermediate hemispheres, receives somatosensory input from the limbs, projects via the interposed nucleus to lateral and corticospinal and rubrospinal systems, controls distal muscles.

Question 9

explain the cerebrocerebellum

Answer 9

largest. receives input from cerebral corext. output via dentate nucleus to motor, pre-motor and prefrontal areas. Involved in planning and rehearsing complex motor tasks and measuring movement errors

Question 10

describe the external layer of the CB

Answer 10

consists of the cell bodies of the inhibitory interneurons, the stellate and basket cells, the excitatory axons of granule cells and dendrites of inhibitory purkinje cells. axons of the granule cells are parralel to parralel fibres and dendrites of purkinje cells are perpendicular to this.

Question 11

explain the purkinje cell layer

Answer 11

this layer is only as think as purkinje cell body (59-80nm) Purkinje cells are only output from CB.

Question 12

explain the Granular layer

Answer 12

granule cells and golgi interneurons, the mossy fibres main input into the CB terminate here, the terminals of thes mossy fibres contact granule cells and this is called cerebellar glomeruli.