Unit III - C.N.VII - Facial Nerve

Question 1

What type of fibers does the facial nerve carry?

Answer 1

Motor and sensory

Question 2

Because it carries both sensory and motor fibers it is considered what type of nerve?

Answer 2

mixed

Question 3

What is the facial nerve known as?

Answer 3

“Nerve of facial expression”

Question 4

What types of sensory does it have?

Answer 4

Special and general sensory

Question 5

What type of special sensory does facial nerve have?

Answer 5

Taste

Question 6

What is the primary nucleus of origin for the facial nerve?

Answer 6

Motor nucleus of the facial nerve

Question 7

What other nucleus contributes fibers to the facial nerve?

Answer 7

Superior salivary nucleus

Question 8

What types of fibers does the superior salivary nucleus contribute to the facial nerve?

Answer 8

Preganglionic parasympathetic fibers

Question 9

Sensory fibers carried in the facial nerve terminate where?

Answer 9

Upper part of the solitary nucleus

Question 10

Where are the cell bodies of the sensory (both special and general) neurons found?

Answer 10

Geniculate ganglion

Question 11

Sensory pathway - General sensation from what is carried to the geniculate ganglion?

Answer 11

External ear and

Lateral tympanic membrane

Question 12

Axons from the external ear and lateral tympanic membrane carry information to where?

Answer 12

Solitary nucleus

Question 13

Taste information also travels thought neurons with cell bodies found in the ________ and terminates in the _______.

Answer 13

Geniculate ganglion

Solitary nucleus

Question 14

Specific fibers that convey taste from the _________ are carried in the ________.

Answer 14

Anterior part of the tongue

Chorda tympani

Question 15

Axons from _____ in the motor nucleus of the facial nerve exit the CNS, travel through the _______ and innervate the muscle of _______.

Answer 15

LMN
Geniculate ganglion
Facial expression

Question 16

The motor nucleus of the facial nerve receives information from ________.

Answer 16

Both cerebral hemispheres

Question 17

The part of the nucleus supplying muscle in the inferior part of the face receives information from?

Answer 17

ONLY the contralateral cortex

Question 18

The motor nucleus also receives information from the?

Answer 18

Reticular formation

Question 19

Preganglionic parasympathetic fibers from the superior salivary nucleus synapse in either the ______ or the ______.

Answer 19

Pterygopalatine ganglion

submandibular ganglion

Question 20

Postganglionic fibers supply the _______, ______, and _____ glands, as well as small glands in the ____ and _____ cavities.

Answer 20

Lacrimal
Submandibular
Sublingual
Oral and nasal cavities

Question 21

Where is the apparent origin of the facial nerve?

Answer 21

Laterally in the sulcus between pons and M.O.

Question 22

Before exiting the CNS, fibers from the motor nucleus first travel _______ and arch around the ______.

Answer 22

posteriorly

Abducens nucleus

Question 23

What two roots are present at the apparent origin?

Answer 23

Motor root (facial nerve proper)
intermediate nerve/root:

Question 24

The intermediate root present at the apparent origin carries what type of fibers?

Answer 24

Sensory and parasympathetic

Question 25

Upon exiting the CNS, both roots travel _______ and enter the ____________, located in the _______.

Answer 25

Together Internal acoustic meats Patrons part of the temporal bone

Question 26

After entering the internal acoustic meats, the roots _______, and enter the _____ and then bend posteriorly, forming the __________ of the facial nerve

Answer 26

combine to form a single trunk Facial canal External genu

Question 27

Where is the geniculate ganglion located?

Answer 27

In the external genu of facial canal

Question 28

What three nerves are given off in the facial canal?

Answer 28

Greater petrosal nerve Nerve to the stapedius Chorda tympani

Question 29

When the greater petrosal nerve comes off of the geniculate ganglion, it travels anteriorward through what?

Answer 29

The hiatus for the greater petrosal nerve

Question 30

The greater petrosal nerve re-enters the petrous part of the temporal bone through what opening?

Answer 30

Foramen lacerum

Question 31

After entering the foramen lacerum, the greater petrosal nerve travels in the _________ and ultimately joins the ________.

Answer 31

pterygoid canal | Pterygopalatine ganglion

Question 32

The greater petrosal nerve carries what type of fibers?

Answer 32

Preganglionic parasympathetic fibers

Question 33

The preganglionic parasympathetic fibers of the greater petrosal nerves stimulate secretions of what glands?

Answer 33

Lacrimal Nasal palatal

Question 34

The greater petrosal nerve also is called?

Answer 34

The superficial petrosal nerve

Question 35

What is the second nerve given off by the facial nerve?

Answer 35

Nerve to the stapedius

Question 36

Where is the nerve to the stapedius give off?

Answer 36

In the facial canal

Question 37

What does the nerve to the stapedius supply?

Answer 37

Stapedius muscle of the middle ear

Question 38

What is special about the stapedius?

Answer 38

Smallest muscle in the body

Question 39

What does the stapedius muscle do?

Answer 39

Stabilizes the shapes, providing protection of loud noises

Question 40

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

Answer 40

Chorda tympani

Question 41

What types of fibers does the chorda tympani fibers carry?

Answer 41

Preganglionic parasympathetic fibers and taste fibers

Question 42

Chorda tympanic traverses what?

Answer 42

The tympanic cavity

Question 43

The chords tympanic leaves the temporal bone through what?

Answer 43

pterygotympanic fissure

Question 44

After leaving the pterygotympanic fissure, the chorda tympani nerve combine with which nerve?

Answer 44

Lingual nerve

Question 45

The lingual nerve is a branch of what division of the trigeminal nerve?

Answer 45

Mandibular

Question 46

All remaining fibers after the three branches are given off are what type in nature?

Answer 46

Motor and somatosensory

Question 47

The remaining fibers after the three branches are given off exit temporal bone through what?

Answer 47

They stylomastoid foramen

Question 48

What are the three branches given off the facial btw the stylomastoid foremen and the parotid gland?

Answer 48

digastric branch stylohyoid branch Posterior articular nerve

Question 49

The digastric branch supplies what?

Answer 49

The superior belly of the digastric muscle

Question 50

The stylohyoid branch supplies what?

Answer 50

The stylohyoid muscle

Question 51

The posterior auricular nerve travel where?

Answer 51

Posterior to the ear

Question 52

The posterior auricular nerve divides into what two branches?

Answer 52

Occipital branch | auricular branch

Question 53

Occipital branch supplies what?

Answer 53

Occipital muscle

Question 54

Auricular branch supplies what?

Answer 54

Posterior auricular muscle | Intrinsic muscles of anterior part of ear

Question 55

After it gives off the fibers, again, it travels into which area?

Answer 55

The parotid gland

Question 56

In the parotid gland the facial nerve forms what?

Answer 56

The parotid plexus

Question 57

In the parotid gland, the plexus gives rise to two trunks:

Answer 57

temporofacial | cervicofacial

Question 58

From these two trunks rise to these five branches

Answer 58

``` Temporal branch Zygomatic branch buccal branch Marginal branch Cervical branch ```

Question 59

These branches supply what?

Answer 59

Muscles of facial expression

Question 60

Temporal branch supplies what?

Answer 60

Intrinsic auricular muscles Superior auricular muscles Anterior auricular muscles

Question 61

In combination with the zygomaticotemporal (V2) and auriculotemporal (V3), they supply these muscles:

Answer 61

orbicularis oculi, corrugator supercili, and frontal belly of the occipitofrontalis

Question 62

Zygomatic branches help supply which muscle?

Answer 62

Orbicularis muscle

Question 63

Buccal branches supply several muscles including what?

Answer 63

buccinators, orbicularis oris, and levator anguli oris

Question 64

The cervical branch travels inferiorly to supply what?

Answer 64

platysma

Question 65

What is Bell's Palsy?

Answer 65

Paralysis of facial nerve. Flaccidity of muscles on same side

Question 66

What is superficial partidectomy?

Answer 66

Surgical removal of the parotid gland.

Question 67

What can happen in a superficial parotidectomy?

Answer 67

May cut facial nerve and auriculotemporal (CN 5) and facial muscles will be affected.