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CANN > Cranial Nerves > Flashcards

Cranial Nerves Flashcards

1
Q

What is the modality of the trigeminal nucleus?

A

Sensory

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2
Q

What nucleus is responsible for taste?

A

Nucleus solitarius

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3
Q

What is CN VII?

A

Facial

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4
Q

What nerves exit the skull via the superior orbital fissure?

A

CN III, IV, V1, VI

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5
Q

What is CN I?

A

Olfactory

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6
Q

Where does CN VII & VIII exit the cranium?

A

Internal acoustic meatus

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7
Q

What is CN XI?

A

Spinal accessory

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8
Q

CN III runs between what two arteries?

A

Superior cerebellar and posterior cerebral arteries

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9
Q

What CN have nuclei in the medulla?

A

CN IX, X, XI, XII

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10
Q

What is CN is the Trigeminal nerve?

A

CN V

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11
Q

How does CN XI innervation of the sternocleidomastoid and trapezius differ?

A

CN XI is contralateral to the trapezius and ipsilateral to the SCM

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12
Q

What is the function of the medial longitudinal fasciculus?

A

The MLF provides a connection between the abducens nucleus and oculomotor nucleus. This allows for medial gaze.

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13
Q

What is CN VI?

A

Abducens

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14
Q

What CN is the Occulomotor nerve?

A

CN III

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15
Q

What nucleus wraps around the abducens nucleus?

A

Facial nucleus wraps around abducens nucleus

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16
Q

What nuclei play a role in the gag reflex?

A

Spinal nucleus of trigeminal (CN IX) & ambiguus (CN X)

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17
Q

What is CN IV?

A

Trochlear

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18
Q

What nucleus is responsible for pupil size and lens shape? What CN synapses at this nucleus?

A

Edinger-Westphal Nucleus, CN III

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19
Q

What is the modality of the ambiguus nucleus?

A

Motor & parasympathetic (CN X)

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20
Q

What CN is the Vestibulocochlear nerve?

A

CN VIII

21
Q

Where is lateral gaze coordinated?

A

Paramedian pontine reticular formation (PPRF)

22
Q

What is the only CN to have nuclei in all regions of the brainstem?

A

Trigeminal

23
Q

Nuclei for what CN are found in the midbrain?

A

CN III, IV, V

24
Q

What are the branches of the Trigeminal nerve?

A

V1 - Ophthalmic
V2 - Maxillary
V3 - Mandibular

25
Q

What nucleus connects V1 and CN VII to induce involuntary eye blinking due to stimulation of the cornea?

A

Trigeminal nucleus

26
Q

What CN are located in the Pons?

A

CN VI, VII, VIII

27
Q

How does control of upper and lower facial muscles differ?

A

The facial nerve innervates both upper and lower facial muscles. The upper muscles have bilateral (ipsilateral and contralateral) control, while the lower muscles only have contralateral control.

28
Q

Axons from the optic nerve synapse where before crossing over at the posterior commissure?

A

Pretectal nuclei

29
Q

Where are the nuclei for the olfactory and optic nerves located?

A

Trick question. CN I & II do not have nuclei. The olfactory nerve connects directly with the temporal lobe. The optic nerve connects directly with the brainstem, thalamus, and hypothalamus.

30
Q

What is CN II?

A

Optic

31
Q

What CN is the hypoglossal nerve?

A

CN XII

32
Q

What are the functions of CN III?

A

Eye movement, maintain open eyelid, pupil size, lens shape

33
Q

What CN is the glossopharyngeal nerve?

A

CN IX

34
Q

What is CN X?

A

Vagus

35
Q

True/False. A lesion on the optic nerve leads to a deficit in the consensual pupillary light reflex in that eye.

A

False. The pupillary light reflex is a branch of CN III and would be functional despite a lesion on CN II. Only a consensual pupillary reflex and not a direct reflex would be present.

36
Q

Motor CN nuclei are found where in the brainstem?

A

Medially

37
Q

Sensory CN nuclei are found where in the brainstem?

A

Laterally

38
Q

What nerve exits the foramen ovale?

A

CN V3

39
Q

Where does the maxillary nerve exit the cranium?

A

Foramen rotundum

40
Q

What structure exits the cranium via the foramen spinosum?

A

Middle meningeal artery

41
Q

What nerves exit the skull via the jugular foramen?

A

CN IX, X, XI

42
Q

Where does CN XII exit the skull? Where is this space located?

A

Hypoglossal canal, located lateral to the foramen magnum

43
Q

What is the only CN to exit the skull via the foramen magnum?

A

CN XI

44
Q

What CN controls most muscles of eye movement?

A

CN III - Occulomotor

45
Q

The superior oblique muscle is controlled by what CN?

A

CN IV - Trochlear

46
Q

What is the only muscle of eye movement innervated by the Abducens nerve?

A

Lateral rectus

47
Q

Taste sensation to the tongue is provided by what nerve?

A

Anterior - CN VII (chorda tympani)

Root - CN IX

48
Q

Motor innervation for most tongue muscles is from what nerve?

A

CN XII

49
Q

What nerves provide general sensory innervation to the tongue?

A

Anterior - CN V3

Root - CN IX & X

CANN (42 decks)

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