cranial nerves 3:) Flashcards
where do the vestibulocochlear nerves arise
junction of pons and medulla
where to the vestibulococlear nerves go
pass through bony canal
exit via internal auditory meatus
vestibulocochlear nerves
auditory/acoustic nerves
- special sensory in hearing and balance
how is sound transmit steps from the ear
sound vibrations enter, go to inner ear
hair projections move, electrical implulses
sound info passes along cochlear nerve
vestibular receives impulses from vestibule and semi circular canals
conductive hearing loss
blockage to middle/outer ear
sensorineural hearing loss
damage to cochlear or CN VIII
clinical test for function of CN VIII
high frequency tuning fork if they cannot hear - place on mastoid process if they can hear: conductive if they can't: sensorineural hearing loss
where does the glossopharyngeal nerve emerge and exit
either side of medulla i.e. brainstem
exits cranial cavity through jugular foramen
what does CN IX do
mucosa of pharyx
posterior 1/3 of tongue
taste sensation to posterior 1/3 tongue
branches of CN IX glossopharyngeal
motor to stylopharyngeaus muscle
visceral sensation from carotid sinuses and bodies
parasympathetic secretomotor to parotid salivary glands
clinical test for CN IX
touch pharyngeal wall for gag reflex
where does the vagus nerve leave brain and exit
medulla as rootlets then thicker nerve
exits via jugular foramen
branches of vagus nerve
motor - pharynx -larynx - soft palate sensory - mucosa of larynx parasympathetic - viscera of thorax and abdomen
damage to vagus nerve
dysarthria
dysphagia
dysphonia
clinical test for vagus nerve
‘ahhh’
-soft palate should raise symmetrically
cough
- weak or absent is damage
