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Neuro- exam 3 > Cranial nerves 7 > Flashcards

Cranial nerves 7 Flashcards

1
Q

fibers of CN 7 make up how many roots?

A

2 roots

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2
Q

What are the 2 roots of CN 7?

A

1) facian nerve proper

2) Nervus intermedius

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3
Q

What does the facial nerve proper of CN 7 contain?

A

SVE and sensory fibers

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4
Q

what does the Nervus Intermedius of CN 7 contain?

A

GVE and sensory fibers

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5
Q

which root of cranial nerve 7 contains general visceral efferent fibers?

A

Nervus intermedius

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6
Q

SVE of cranial nerve 7

A

Muscles of facial expression (from facial motor nucleus)

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7
Q

GVE CBO of cranial nerve 7

A

Superior salivatory nucleus

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8
Q

what are the 2 divisions of the superior salivatory nucleus?

A

Submandibular ganglion

Pterygopalatine ganglion

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9
Q

GSA of the facial nerve (CN VII)

A

Skin of ear

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10
Q

SVA of cranial nerve VII

A

taste- to anterior 2/3 of tongue (to solitary nucleus)

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11
Q

GVA of CN VII

A

Palatine tonsil & posterior nasal cavity (to solitary nucleus)

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12
Q

Sensory inputs and parasympathetic outputs are carried to and from the geniculate ganglion by what?

A

the nervus intermedius

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13
Q

where do the GSA fibers of CN 7 terminate? what ganglion do they pass through?

A

synapse in the geniculate ganglion (its CBO)

terminate at the Trigeminal spinal nucleus

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14
Q

where do SVA fibers of the facial nerve terminate?

A

Solitary nucleus- after synapsing in the geniculate ganglion (its CBO)

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15
Q

where do the GVA fibers of CN 7 terminate?

A

Solitary nucleus- after synapsing in the geniculate ganglion (its CBO)

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16
Q

where do fibers of CN 7 exit the skull?

A

Stylomastiod foramen

17
Q

fibers of CN 7 pass through what structure? (a plexus is formed here)

A

Parotid gland

18
Q

branches of CN 7 after they pass thru the parotid gland innervate what?

A

1) External ear (posterior auricular)

2) facial muscles

19
Q

Parasympathetic components of the Nervus intermedius:

A

A) Superior salivatory nucleus
B) Greater petrosal nerve
C) Chorda tympani nerve

20
Q

where does the greater petrosal nerve synapse?

A

Pterygopalatine ganglion

21
Q

what ganglion is associated with the chord tympani nerve?

A

Submandibular ganglion

22
Q

What is the visceral afferent portion of the facial nerve responsible for?

A

Taste- anterior 2/3 of tongue

feeling to tonsils and posterior nasal cavity

23
Q

action of facial nerve- SVE

A
  • Muscles of facial expression

- Stapedius muscle

24
Q

Action of the facial nerve- GVE

A

salivation and lacrimation

25
Q

what causes Bell’s Palsy?

A

Facial nerve lesion

26
Q

why is irritation of the cornea a common symptom of Bell’s Palsy?

A

CN 7 controls the closure of the eyelid and lacrimation- lesion will lead to dry eyes

27
Q

where is paresis observed in Bell’s palsy

A

above & below the eye

28
Q

Bell’s palsy sufferers see a reduced production of what?

A

tears and saliva

29
Q

Facial nerve paralysis

A

paralysis is complete over half the face

30
Q

T/F: both nerve components of CN 7 course thru the facial canal

A

true

31
Q

the facial nerve turns in the facial canal to form what?

A

external genu

32
Q

where is the geniculate ganglion found?

A

at the genu

33
Q

which fibers exit the facial canal before the stylomastiod foramen?

A

-Stapedial nerve

-branches to pterygopalatine ganglion
(greater petrosal nerve)

-Chorda tympani nerve

34
Q

the chorda tympani nerve carries what types of fibers?

A

GVE to submandibular ganglion

SVA from tongue

35
Q

crocodile tears:

A

Unilateral tearing seen in anticipation of, and during meals

36
Q

what causes crocodile tears?

A

para-symp fibers to submandibular gland have been re-routed to pterygopalatine ganglion

37
Q

Supranuclear lesion- symptoms

A

paralysis of muscles of facial expression below the level of the eye

38
Q

which side of the face is paralyzed during a supranuclear lesion?

A

located opposite the side of the lesion

Neuro- exam 3 (9 decks)

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