CN VII: facial nerve

Question 1

what muscles does the facial nerve innervates?

Answer 1

muscles of facial expression
posterior belly of digastric
stylohyoid muscle
stapedius muscle

Question 2

what is the function of the posterior belly of the digastric muscle?

Answer 2

swallowing and chewing

Question 3

what is the function of the stylohyoid muscle?

Answer 3

pulls the hyoid bone upwards and backwards, resulting in elevation of the base of the tongue and elongates the floor of the mouth

Question 4

what is the function of the stapedius muscle?

Answer 4

dampens the vibration of the stapes in the ear, by pulling the neck of that bone

Question 5

what are the sensory innervations of the facial nerve?

Answer 5

area around the external ear
taste sensation to anterior 2/3rd of tongue

Question 6

what is the parasympathetic innervation of the facial nerve?

Answer 6

submandibular gland
bilingual salivary gland
nasal gland
palatine gland
pharyngeal glands
lacrimal gland

Question 7

what is Bell’s palsy?

Answer 7

temporarily weakness in one half of the face due to facial nerve impairment at the facial canal

Question 8

what are s&s of Bell’s palsy?

Answer 8

unilateral facial weakness
drooping eyelid and corner of mouth
drooling
dry mouth
loss of taste
dry or watering eye

Question 9

what is the Ramsay-Hunt syndrome/ Herpes zoster oticus?

Answer 9

a late complication of the varicella-zoster virus infection that results in the inflammation of the geniculate ganglion of the facial nerve

Question 10

what are symptoms of the Ramsay-Hunt syndrome?

Answer 10

vesicular rash on external ear
loss of taste sensation over 2/3rd of tongue
difficulty speaking and swallowing
loss of facial expressions of affected side