Vestibulocerebellum

Question 1

Where do vestibular afferents project?

Answer 1

to the cortex of vestibulocerebellum and to the fastigial nucleus via inferior cerebellar peduncle

Question 2

primary afferent fibers are directly from?

Answer 2

ipsilateral CN VIII

Question 3

axons from secondary sensory neurons are from which nuclei?

Answer 3

ipsilateral vestibular nuclei

Question 4

What do vestibular afferents influence?

Answer 4

distribution of tone in limbs, trunk, neck, and extraocular eye muscles

Question 5

How do visual systems project into the vestibulocerebellum?

Answer 5

indirectly through climbing fibers of the inferior olivary nucleus

Question 6

What is the role of the visual systems in the vestibulocerebellum?

Answer 6

assist in regulating the vestibular ocular reflex

Question 7

There are also outputs of the vestibulocerebellum through vestibular nuclei. What do they influence?

Answer 7

• influence extraocular motor neurons via the medial longitudinal fasciculus
• influence body and limb tone and responses via the vestibulospinal tracts

Question 8

Vestibulocerebellum outputs to the brainstem also end in nuclei of what structure?

Answer 8

reticular formation

Question 9

Reticular formation nuclei send out two things from the vestibulocerebellum?

Answer 9

• descending fibers forming the reticulospinal tracts

- ascending fibers to extraocular motor nuclei

Question 10

What are the functions of the vestibulocerebellum (flocculonodular lobe)?

Answer 10

• balance in sitting, standing and gait
• plasticity of vestibule-ocular reflex
• nodule function related to sensitivity to motion sickness (ablated this makes subject immune to motion sickness)