Cranial Nerves Facial

Question 1

SVE

Answer 1

skeletal motor to facial expression muscles

Question 2

SVA

Answer 2

taste sensation to anterior 2/3 tongue

Question 3

GVE

Answer 3

parasymp to glands (lacrimal, nasal, palatine, submandibular sublingual)

Question 4

GVA

Answer 4

sensory from nasal cavity, soft palate, adj pharyngeal wall

Question 5

GSA

Answer 5

sensory from skin @ posterior ear, pinna, external auditory meatus

Question 6

geniculate ganglion

Answer 6

swelling of facial n in facial canal
-sensory
-cell bodies of GSA, GVA, SVA

Question 7

greater petrosal nerve

Answer 7

GVE, GVA

Question 8

chorda tympani n

Answer 8

SVA, GVE

Question 9

nerve of stapedius

Answer 9

SVE
prevents stapes from oscillating

Question 10

exits cranial vault out of

Answer 10

stylomastoid foramen

Question 11

lesion of preganglionic parasymps

to pterygopalatine gangila

Answer 11

gets regenerated and target is reached

Question 12

lesion of preganglionic parasymps

to submandibular

Answer 12

crocodile tear syndrome
-when eating instead of salivating by sublingual and submand you cry bc axons go to pterygopalatine ganglion with chorda tympani

lesion is in facial canal (proximal to geniculate gang)

Question 13

solitary tract

Answer 13

taste sensation processed at solitary nucleus
-carries SVA and GVA

projects to hypothalamus to mediate visceral resp to unpleasant stim aka vomit

Question 14

UMN lesions are

Answer 14

purely MOTOR for corticonuclear tract
-nothing to do with sensory, parasymps

Question 15

bell’s palsy

Answer 15

LMN lesion aka in the facial canal proximal (before)
-eyes, ear, mouth all affected (entire half of face ipsilateral to lesion)
-orbicularis oculi, stapes,

Question 16

causes of bell’s palsy

Answer 16

viral infection of facial nerve in canal
-demyelination conduction block but can recover

dry eye from greater petrosal nerve (GVE)
hyperacusis from nerve to stapedius (SVE)
ear pain from geniculate ganglion
loss of taste from chorda tympani nerve

Question 17

lesion distal stylomastoid foramen

Answer 17

mainly motor deficit ipsilateral
-sensory deficit to outer ear

Question 18

middle cerebral A occlusion

Answer 18

lesion in lateral motor and sensory
-trunk, upper limb, face

contralateral

Question 19

lenticulostriate A occulsion

Answer 19

supper ant and post limbs of internal capsule
-extensive and serious motor and sensory deficits since corticonuclear tracts course in genu

Question 20

facial nucleus

Answer 20

for motor, has cell bodies of LMN

Question 21

superior salivatory nucleus

Answer 21

for parasymps, has cell bodies of pregang parasymp for axons that synapse in pterygopalatine or submandibular ganglia

Question 22

solitary nucleus

Answer 22

for sensory, receives central processes of SVA (taste) and GVA neurons
-shared with glossopharyngeal and vagus nerve

Question 23

spinal tract of trigeminal

Answer 23

since facial, glosso, vagus not have pain nucleus of own it sends fibers of nociception (GSA) to spinal tract of V to terminate in pain nucleus

Question 24

parts of corneal blink reflex

Answer 24

1. afferent/sensory limb via ophthalamic of V (V1)
2. efferent/motor via facial to orbicularis oculi

can either be direct (same side as stim) or consensual (resp on oppo side)