CN VIII: Vestibulocochlear Nerve

Question 1

Emerges from?

Answer 1

pontomedullary groove

Question 2

Passes through?

Answer 2

internal acoustic meatus/internal auditory canal

Question 3

What is the special sense innervations of CN VIII?

Answer 3

• cochlear nerve (hearing)

- vestibular nerve (equilibrium and balance)

Question 4

What does the cochlear nerve innervate?

Answer 4

cochlea

Question 5

What does the vestibular nerve innervate?

Answer 5

• semicircular canals
• vestibule
  sensory receptors in the vestibular labyrinth

Question 6

What could a fracture to the petrous portion of the temporal bone cause?

Answer 6

• hearing loss

- vertigo

Question 7

What happens if you’re born without sensory receptors in your vestibular labyrinth?

Answer 7

born deaf