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Anatomy Module IV > Gross Anatomy of the Facial Nerve > Flashcards

Gross Anatomy of the Facial Nerve Flashcards

1
Q

large motor root of CN VII caries what fibers

A

SVE

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2
Q

smaller root of CN VII

A

nervus intermedius with GVE, SA, GSA, and GVA fibers

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3
Q

intraosseous course of facial nerve

A

from posterior cranial (first to emerge) through the internal acoustic meatus – courses through the facial canal - which takes a lateral course and more inferior –> leaves at the styloimastoid foramen which is between the styloid process and mastoid process

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4
Q

branches of the facial nerve as it traverses the facial canal

A 
Within the temporal bone 
Greater petrosal nerve 
Chorda tympani nerve
nerve to the stapedius 
Sensory branch of CN VUU (joins CN -X)
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5
Q

greater petrosal nerve associated with?

A

maxillary nerve - giving fibers (GVE)

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6
Q

chorda tympani nerve associated with?

A

mandibular nerve - giving fibers of GVE and SA from CN VII

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7
Q

Branches of the facial nerve after exiting the skull via the styloimastoid foramen

A 
Posterior auricular nerve 
Digastric Branch
Stylohyoid branch
Temporal Branch
Zygomatic Branch
Buccal Branch (of CN VII)
Mandibular /marginal mandibular branch 
Cervical branch
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8
Q

sensory ganglion associated with CN VII

A

Geniculate ganglion

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9
Q

greater petrosal nerve

origin and course

A

emerges from the geniuclate ganglion and travels within the temporal bone before passing into the middle cranial fossa via the hiatus for the greater petrosal nerve –> then towards the opening of the carotid canal –> where it UNITES WITH THE DEEP PETROSAL NERVE (SYMPATHETIC FIBERS coming off of the internal carotid artery and its plexus) to form the nerve of the pterygoid canal

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10
Q

nerve of the pterygoid canal

A

merging of the greater petrosal nerve and the deep petrosal nerve and travels in the pterygoid canal

this nerve will travel along/within the cartilage that fills foramen lacerum –> traverse the pterygoid canal (vidian canal) –> enter the PPG

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11
Q

chorda tympani nerve
origin
course

A

has to pass posterior to anterior
emerges from CN VII within the facial canal - travels superior and anterior before passing toward the tympanic cavity via POSTERIOR CANALICULUS FOR THE CHORDA TYMPANI –> then proceeds anteriorly to travel within the layers of the tympanic membrane and acorss the handle of the malleus–> re-enters the temporal bone via the ANTERIOR CANALOCULUS for the chorda tympani –> leaves the temporal bone via the pterygotympanic fissure into the infratemporal fossa

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12
Q

importance of pterygotympanic fissure

A

at tympanic plate of temporal bone and where the chorda tympani will go from the temporal bone and into the infratemporal fossa where it WILL JOIN WITH THE LINGUAL NERVE

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13
Q

position of chorda tympani in the infratemporal fossa

A

it is positioned MEDIAL TO THE SPINE OF SPHENOID (away from the TMJ) – and courses anteriorly to join the lingual nerve and contributing GVE, SA, and GVA fibers

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14
Q

temporofacial trunk

A

trunk off of CN VII AFTER EXITING SKULL via the stylomastoid foramen
this trunk typically gives rise to temporal, zygomatic and buccal branches of CN-VII

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15
Q

Cervicofacial trunk

A

trunk off of CN VII AFTER EXITING SKULL via the stylomastoid foramen
this trunk typically gives rise to the buccal, marginal madnibular and cervical branches

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16
Q

what gives rise to the parotid plexus?

A

branches from the temporofacial and cervicofacial trunks

17
Q

Distribution of temporal branch

A

muscle in morehead, temporal, supraorbital regions, anterior and posterior auricular muscles
SVE

18
Q

sensory ganglion associated with CN VII

A

Geniculate ganglion

so we have pseudounipolar neurons

19
Q

where does the the chorda tympani nerve end up

A

in the infratemporal fossa - gets there by taking a posterior to anterior route
exits bone - tympanic cavity - re enters bone and then exits again through the petrotympanic fissure to reach the ITF

20
Q

what fiber types do the chorda tympani contribute when it enters the infratemporal fossa?

A

GVE, SA,

21
Q

fiber type of the branches from CN VII after traversing the stylomastoid foramen

A

SVE

- the nerve to the stapedius also had this as well

22
Q

distribution of zygomatic branch and fiber type

A

SVE fibers from CN VII

muscles at angle of the eye, infraorbital region, upper nasal region

23
Q

distribution of buccan branch and fiber

A

SVE from CN VII

muscles in lower nasal and upper lip region

24
Q

distribution of marginal mandibular branch and fiber type

A

SVE from CN VII

going to the muscles in lower lip and chin

25
Q

Cervical branch distribution and fiber type

A

SVE from CN VII

supply the platysma

26
Q

Digastric branch

A

innervates - SVE of the posterior digastric

27
Q

Stylohyoid branch

A

stylohyoid

28
Q

Posterior auricualr nerve

branches and distribution

A

Gives rise to auricalar branch and occipital branch
both SVE from CN VII
Auricaular - posterior auricular muscle
Occipital branch - occipital belly of the occipitofrontalis muscle

29
Q

what type of ganglion is the PPG?

A

PARAYMPATHETIC

-so the nerve of the pterygoid canal WILL SYNAPSE HERE - caryying the GVE fibers from CN VII - connecting with V2

30
Q

resident fibers of CN V

A

GSA and SVE

31
Q

where are the GVE sympathetic fibers from

A

the superior cervical ganglion

NO synapse in the PPG because these are ALREADY POSTGANGLIONIC

32
Q

what type of ganglion is the submandibular

A

parasympathetic

33
Q

what provides the parasympathetic outflow from the PPG

A

CN VII - specifically the nerve of the ptergoid canal synapses and then is distributed throughout V2

34
Q

T/F you will never see a sympathetic fiber leave the brainstem in this region

A

TRUE - the postganglionic fibers leave the superior cervical ganglion
so the sympathetic fibers (GVE) that are distributed within this nerve are postganglionic

35
Q

fiber types in the greater petrosal nerve?

A

Taste (SA) and Parasympathetic (GVE fibers)

36
Q

fiber types in the nerve of the pterygoid canal

A

taste (SA), parasympathetic

and sympathetic

Anatomy Module IV (12 decks)

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