Vestibular system

Question 1

Consist of

Answer 1

secondary sensory neuroepithelial receptor cells
sensory neurons
vestibular nuclei

Question 2

Sensory hair cells

Answer 2

in macula of utriculi and sacculi - sensitive to linear acceleration
in cristae ampullares - sensitive to angular acceleration

Question 3

1st order neuron

Answer 3

bipolar
in vestibular ganglion at funds of internal acoustic meatus
activity of hair cells transmitted to vestibular nuclei

Question 4

Vestibular nuclei

Answer 4

Superior, lateral, medial and inferior

afferent: vestibular nerve, cerebello-vestibular

Question 5

Neurons in medial and interior vestibular nuclei

Answer 5

to vestibulocerebellum (vestibulocerebellar tract)

Question 6

Neurons in lateral vestibular nucleus

Answer 6

to spinal cord (vestibulospinal tract)

uncrossed, terminate in intermediate zone and ventral horn

Question 7

Medial longitudinal fasciculus

Answer 7

axons of superior, medial and inferior vestibular nuclei
in upper cervical segments to midbrain to extraoccular muscle nuclei, spinal cord, primary vestibular cortex
both crossed and uncrossed

Question 8

Vestibular system mainly projects to

Answer 8

1. Motor nuclei of oculomotor, trochlear, abducent: control reflex eye movement
2. Cerebellum: coordination of head and body movements
3. Reticular formation: reflex motor activity initiated
4. Spinal cord: postural adjustments