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Neuro > Cranial Nerves > Flashcards

Cranial Nerves Flashcards

1
Q

CN 1 Olfactory

A

Pure sensory
MC contoused
Shortest CN
Involved c TBI (3, 7, 1)
Lesion: Anosmia
Exit: Cribriform plate of ethmoid

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2
Q

CN 2 Optic

A

Pure sensory
CN c thickest myelin sheath
Not a true peripheral nerve (myelination is from oligodendrocytes)
Involved c increased ICP
Involved c MS (2)
Lesion: I/L Monocular blindness
Exit: Optic canal

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3
Q

CN 3 Oculomotor

A

Pure motor
Involved with the following:
DM (3, 6)
TBI (3, 7, 1)
PD (3, 7, 9)
Botulism and MG (3, 4, 6)
Lesion: External strabismus
Exit: Superior orbital fissure

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4
Q

Argyll Robertson Pupil

A

CN 3
impaired pupillary light reflex c intact accomodation

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5
Q

Levator palpebrae is innervated by?

A

CN 3
80% eye opening

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6
Q

Mueller’s muscle is innervated by?

A

Sympathetic NS
Involved c horner’s
20% eye opening
Lesion: Ptosis

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7
Q

CN 4 Trochlear

A

Motor only
Only crossed CN; Stupid nerve
Thinnest CN
Longest intracranially
Only CN arising from the dorsum of the brainstem
Involved with:
MG and Botulism (3, 4, 6)

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8
Q

Lesion in CN 4 leads to?

A

Vertical diplopia
I/L tilt to compensate

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9
Q

CN 5 Trigeminal

A

Mixed CN
Largest CN
Involved with:
Leprosy (5, 7)
Tic douloureux/Trigeminal neuralgia

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10
Q

3 Sensory Nuclei of CN 5

A

At the brainstem
Midbrain: Mesencephalic nucleus (Proprioception )
Pons: Main sensory nucleus (light touch)
Medulla: Spinal nucleus (pin prick, pain and temp)

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11
Q

CN 5 motor fxn

A

Mastication:
TIME mm
Mouth closing: temporalis, internal pterygoid, mentalis
Mouth opening: external pterygoid
Other mm: tensor tympani, tensor valu palatini, ant. digastric, mylohyoid

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12
Q

CN 5 sensory fxn

A

Facial sensation plus general sensation on the anterior tongue

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13
Q

CN 6 Abducens

A

Pure motor (LR6)
Involved c:
DM (3, 6)
MG and Botulism (3, 4, 6)
Lesion: Horizontal diplopia; to compensate: I/L rotate
Lesion: Internal strabismus / Esotropia

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14
Q

CN 7 Facial

A

Mixed CN
Involved with:
TBI (3, 7, 1)
PD (3, 7, 9)
GBS (7)
Sjogren syndrome (7, 9)
Leprosy (5, 7)
Bell’s palsy

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15
Q

CN 7 sensory fxn

A

Ant 2/3 taste of tongue

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16
Q

CN 7 motor fxn

A

Facial expressions;
innervates: posterior digastric and stapedius (lesion: hyperacusis)

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17
Q

Zygomaticus major action

A

True smile

18
Q

Risorius action

A

Grimace

19
Q

Corrugator supercilii action

A

Frowning

20
Q

Procerus action

A

Distaste

21
Q

Frontalis action

A

Surprise

22
Q

Orbicularis oris action

A

Kissing

23
Q

Orbicularis oculi action

A

eye closing

24
Q

CN 8 Vestibulocochlear

A

Pure sensory
Involved with:
Meniere’s disease
Vertigo

25
Q

CN 8 Vestibular part is responsible with?

A

Balance; Lesion: disequilibrium

26
Q

CN 8 Cochlear part is responsible with?

A

Hearing; Lesion: Sensorineural hearing loss (irreversible)

27
Q

CN 9 Glossopharyngeal

A

Mixed CN
Swallowing and gag reflex (afferent)
Lesion: difficulty c swallowing

28
Q

CN 9 motor fxn

A

innervates stylopharyngeus

29
Q

CN 9 sensory fxn

A

general sensation and taste of the posterior 2/3 of tongue

30
Q

CN 10 Vagus nerve

A

Mixed CN
Longest CN extracranially
Lesion: dysphagia, dysphonia
Gag reflex (efferent)

31
Q

CN 10 motor fxn

A

pharyngeal (palatoglossus) and laryngeal (phonation) mm

32
Q

CN 10 sensory fxn

A

back of the ear, external pinna of the ear, throat

33
Q

Lesion to CN 10 tongue deviation towards?

A

I/L to the lesion

34
Q

Lesion to CN 10 uvula deviation towards?

A

C/L to the lesion

35
Q

Uvula deviation (central/peripheral)

A

Central (I/L)
Peripheral (C/L)

36
Q

CN 11 Spinal Accessory

A

Pure motor
Traps and SCM

37
Q

Radical neck dissection results to?

A

Lateral winging of the scapula (sliding door paralysis)

38
Q

MC form of dystonia

A

Torticollis

39
Q

CN 12 Hypoglossal

A

Pure motor
Lesion: Dysarthria

40
Q

CN 12 motor fxn

A

Innervates intrinsic mm of the tongue. Extrinsic mm (genioglossus, hyoglossus, styloglossus)

Neuro (6 decks)

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