CN8

Question 1

what part of the ear detects static head position

Answer 1

saccule and utricle

Question 2

what part of the ear detects sound?

Answer 2

cochlea

Question 3

what part of the ear detects dynamic head movements?

Answer 3

semicircular canals

Question 4

common sx involving inner ear

Answer 4

hearing loss
tinnitus
spinning sensation
balance problems
nystagmus

Question 5

common pathologies of inner ear

Answer 5

labyrinthitis or vestibulocochlear neuritis
benign postional vertigo
meniere’s disease

Question 6

normally when your head turns to the right, your eyes drift?

Answer 6

to the left

Question 7

when there is damage to the L CN8, your eyes will drift to?

Answer 7

to the left with a RIGHT beating nystagmus

Question 8

jaw jerk reflex:
IN=
OUT=
Central Connection=

Answer 8

IN= 5 (V3 Mandibular)
OUT= 5 (V3) → M of Mastication
Central Connection= Mesencephalic N → Trigeminal Motor N*

Question 9

Corneal reflex
IN=
OUT=
Central Connection=

Answer 9

IN= 5 (V1- Nasociliary)
OUT= 7 → orbicularis occuli
Central Connection= Spinal Trigeminal N→ Facial Motor N

Question 10

Gag Reflex
IN=
OUT=
Central Connection=

Answer 10

IN= 9
OUT= 10 ==> pharyngeal/ laryngeal m
Central Connection= Spinal Trigeminal N* → Ambiguus N/Reticular F

Question 11

Salivary Reflex
IN=
OUT=
Central Connection=

Answer 11

IN= 7 (chorda tympani branch V2)
OUT= 7/9→ Salivary gland
Central Connection= Solitary N (rostral)* → Sup/Inf Salivatory N ** →Pterogopalatine/ Submandibular/Otic G ***

Question 12

Carotid Sinus reflex
IN=
OUT=
Central Connection=

Answer 12

IN= 9
OUT= 10
Central Connection= Solitary N (caudal)* → Dorsal Motor N PNS Neurons **