Facial Nerve

Question 1

What type of fibers are carried by CN VII?

Answer 1

motor and sensory

Question 2

T/F: CN VII is know as “the great sensory nerve of the face.”

Answer 2

False; it is the “nerve of facial expression.”

Question 3

What is the primary nucleus of origin for CN VII?

Answer 3

motor nucleus of the facial nerve

Question 4

What does the superior salivatory nucleus contribute tot the facial nerve?

Answer 4

pregnglionic parasympathetic fibers

Question 5

Where do sensory fibers carried in the facial nerve terminate?

Answer 5

upper part of the solitary nucleus

Question 6

What is the other name for the solitary nucleus?

Answer 6

nucleus solitarius

Question 7

Where are the cell bodies of the sensory neruons found for CN VII?

Answer 7

genniculate ganglion

Question 8

What is the proper name for the eardrum?

Answer 8

lateral tympanic membrane

Question 9

Where is general sensation from the external ear and lateral tympanic membrane carried to?

Answer 9

geniculate ganglion

Question 10

Sensory information delivered to the solitary nucleus come from axons from where?

Answer 10

geniculate ganglion

Question 11

Other than general sensation, neurons with cell bodies located in the geniculate ganglion also carry what kind of information?

Answer 11

taste

Question 12

Where do sensory neurons with cell bodies located in the geniculate ganglion terminate?

Answer 12

Solitary nucleus

Question 13

What part of the tongue do the neurons in the chorda tympani carry info from?

Answer 13

anterior 2/3

Question 14

What structure divides the tongue into an anterior 2/3 and posterior 1/3?

Answer 14

sulcus terminalis

Question 15

T/F: axons in the motor nucleus of the facial nerve that travel throught the geniculate ganglion are upper motor neurons.

Answer 15

False; these are lower motor neurons

Question 16

Which cerebral hemisphere sends information to the motor nucleus of CN VII?

Answer 16

both

Question 17

What part of the face receives motor info ONLY from the contralateral cortex?

Answer 17

inferior part

Question 18

T/F: the reticular formation sends info to motor nucleus, of CN VII.

Answer 18

True

Question 19

Where do preganglionic parasympathetic fibers from the superior salivatory nucleus synapse?

Answer 19

either the pterygopalatine ganglion or the submandibular ganglion.

Question 20

What kind of fibers from the superior salivatory nucleus synapse in the pterygopalatine ganglion?

Answer 20

preganglionic parasympathetic

Question 21

Postganglionic fibers in the parasympathetic pathway of CN VII supply several gland. What specific glands were mentioned in class?

Answer 21

lacrimal, submandibular, sublingual and small glands in the oral and nasal cavities.

Question 22

What is the apparent origin of the Facial nerve?

Answer 22

laterally in the sulcus between the pons and medulla oblongata; near the cerebellopontine recess

Question 23

Before exiting the CNS, fibers from the motor nucleus of the facial nerve travel where?

Answer 23

posteriorly and arch around the abducens nucleus

Question 24

What two roots are present at the apparent origin of CN VII

Answer 24

Motor root and intermediate nerve/root

Question 25

what is another name for the motor root of the facial nerve?

Answer 25

facial nerve proper

Question 26

What kind of fibers are carried by the intermediate nerve of CN VII?

Answer 26

sensory and parasympathetic

Question 27

Upon exiting the CNS, both roots of CN VII travel together and enter what opening?

Answer 27

internal acoustic meatus

Question 28

Where is the internal acoustic meatus located?

Answer 28

the petrous part of the temporal bone

Question 29

What nerve comes off the geniculate ganglion and travels anteriorward?

Answer 29

the greater petrosal nerve

Question 30

What opening does he greater petrosal nerve travel through after coming off the geniculate ganglion?

Answer 30

hiatus for the greater petrosal nerve

Question 31

Where does the greater petrosal nerve reenter the petrous part of the temporal bone?

Answer 31

formen lacerum

Question 32

What nerver travels through the pterygoid canal to ultimately join the pterygopalatine ganglion?

Answer 32

greater petrosal nerve

Question 33

What kind of fibers does the greater petrosal nerve carry?

Answer 33

preganglionic parasympathetic fibers

Question 34

What glands does the greater petrosal nerv stimulate secretions for?

Answer 34

lacrimal, nasal and palatal glands

Question 35

What is the other accepted name for the greater petrosal nerve?

Answer 35

superior petrosal nerve

Question 36

What is the second nerve given off of the facial nerve inside the facial canal?

Answer 36

the nerve to stapedius

Question 37

What nerve innervates the stapedius?

Answer 37

nerve to the stapedius

Question 38

What nerve contains the only motor fibers that leave the facial nerve in the facial canal?

Answer 38

nerve to stapedius

Question 39

Where is the stapedius located?

Answer 39

the middle ear

Question 40

What is the third branch coming off the facial nerve in the facial canal?

Answer 40

chorda tympani

Question 41

What kind of fibers are carried by the chorda tympani?

Answer 41

preganglionic parasympathetic fibers and taste fibers

Question 42

What cavity does the chorda tympani traverse?

Answer 42

tympanic cavity

Question 43

Where does the chorda tympani exit the temporal bone?

Answer 43

pterygopalatine fissure

Question 44

Whaat nerve does tthe chorda tympani combine with after exiting the temporal bone?

Answer 44

the lingual nerve of the the mandibular division

Question 45

What kind of fibers associated with the facial nerve exit the stylomastoid foramen?

Answer 45

motor and somatosensory

Question 46

How many branches come off of the facial nerve between the stylomastoid foramen and the parotid gland?

Answer 46

3

Question 47

What are the branches that come off of the facial nerve between the stylomastoid foramen and the parotid gland?

Answer 47

digastric branch, stylohyoid branch and posterior auricular nerve

Question 48

What nerve supplies the posterior belly of the digastric muscle?

Answer 48

the digastric branch of the facial nerve

Question 49

What nerve innervates the stylohyoid muscle?

Answer 49

stylohyoid branch

Question 50

In addition to motor fibers, what other fibers are carried by tthe digastric and stylohyoid branches?

Answer 50

proprioceptive fibers

Question 51

What branch of the facial nerve travels posterior to the ear?

Answer 51

the posterior auricular nerve

Question 52

What are the two branches of the posterior auricular nerve?

Answer 52

occipital branch and auricular branch

Question 53

T/F: all autonomic fibers carried in CN VII are given off inside of the facial canal.

Answer 53

True

Question 54

What are the two trunks that arise from the parotid plexus?

Answer 54

temporofacial and cervicofacial

Question 55

What are the five branches of the two trunks which arise from the parotid plexus?

Answer 55

Temporal, zygomatic, buccal,marginal mandibular, and cervical branches (ten zebras bit my mother's cheek)

Question 56

What is innervated by the parotid plexus?

Answer 56

muscles of facial expression

Question 57

What nerve of the parotid plexus innervates the intrinsic auricular muscles?

Answer 57

temporal branch

Question 58

what nerve of the parotid plexus innervates the superior and anterior auricular muscles?

Answer 58

Temporal branch

Question 59

What nerve(s) innervate the orbicularis oculi, corrugator supercilli, and frontal belly of the occipitofrontalis?

Answer 59

the temporal branch of the parotid plexus in combination with the zygomaticotemporal nerve (V2) and the auriculotemporal branch (V3)

Question 60

What do the zygomatic branches help supply?

Answer 60

orbicularis oculi

Question 61

What muscles are innervated by the buccal branches of the parotid plexus?

Answer 61

buccinator, orbicularis oris, and levator anguli oris

Question 62

If the temporal branch supplies motor innervation to the orbicularis ocul, corrugator supercilii, and frontal belly of occipitofrontalis, what nerves supply the sensory info?

Answer 62

zygomaticotemporal nerve (V2) and auriculotemporal branch (V3)

Question 63

what muscles are innervated by the marginal mandibular branch of the parotid plexus?

Answer 63

risorius and muscles of the lower lip/chin.

Question 64

What branch of the parotid plexus may join up with the mentl nerve?

Answer 64

marginal mandibular branch

Question 65

What does the cervical branch innervate?

Answer 65

platysma

Question 66

This clinical consideration may appear very similar to a stroke but is localized to only the face. One side of the face will be without expression; unkown cause typically; can last months. What is this called?

Answer 66

Bell's Palsy

Question 67

What surgery is particularly dangerous with regard to the parotid plexus?

Answer 67

Superficial parotidectomy