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Neuroanatomy Exam 1 > Cranial nerves III, IV & VI > Flashcards

Cranial nerves III, IV & VI Flashcards

1
Q

CN V modality…

A

Somatic sensory (skin, muscles, joints in head)

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2
Q

CN X modality…

A

Viceral sensory (Cranial, thoracic, abdominal viscera)

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3
Q

CN VII & IX modality…

A

Viceral Sensory (Taste buds)

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4
Q

CN VIII modality…

A

Special (inner ear)

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5
Q

CN III, IV &VI Modality….

A

Somatic motor (Extraocular muscles)

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6
Q

CN XII modality…

A

Somatic motor (Tongue muscles)

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7
Q

CN X modality…

A

Viceral motor (Parasympathetic ganglia for cranial, thoracic and abdominal.)

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8
Q

CN V, VII, X, XI modality….

A

Brachial motor (Jaw muscles, facial muscles, laryngeal & pharyngeal muscles, middle ear muscles, SCM & trapezius muscles.)

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9
Q

Function of Superior rectus muscle…

A

Elevation of eye

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10
Q

Function of Inferior rectus muscle..

A

Depression of eye

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11
Q

Function of lateral rectus..

A

Abduction of eye

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12
Q

Function of Medial rectus…

A

Adduction of eye

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13
Q

Function of superior oblique muscle..

A

Internal rotation of eye (intorsion)

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14
Q

Function of Inferior oblique muscle

A

External rotation (Extorsion) of eye

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15
Q

Results of CN III injury.. (8 things)

A
  • Eye ipsilateral to lesion deviates laterally.
  • Patient cannot move eye medially
  • Vertical movement impaired
  • Diplopia: double vision
  • Ipsilateral levator palpebrae superioris is weak.
  • Mydriasis = puplis on affected side is dilated.
  • Pupil does not constrict in response to light.
  • Lens cannot be focused for near vision
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16
Q

CN IV innervates what?

A

Contralateral superior oblique muscle!

17
Q

Results of CN IV injury… (2 things)

A
  • Much less noticeable than III
  • Sup. Oblique moves eye downward and laterally.
  • Patients report diplopia when going downstairs or reading.
18
Q

CN VI innervates what?

A

Ipsilateral Lateral rectus Muscle.

19
Q

Results of CN VI injury..

A
  • Causes medial strabismus and lateral gaze paralysis
  • Ipsilateral eye will not abduct past midpostion and contralateral eye will not adduct past midpostion.
  • Nucleus contains motor neurons and internuclear neurons that ascend in the MLF (Medial longitudinal fasciculus)
20
Q

Describe the function of the Medial Longitudinal Fasciculus…

A
  • MLF allows coordination of head and eye movements.

- Interconnects III, IV, & VI nuclei to allow this.

21
Q

MLF injury results in… (4 things)

A
  • Internuclear ophthalmoplegia (Paralysis of the eye due to damage between the nuclei)
  • Removes excitatory input to ipsilateral III nucleus.
  • Eye Ipsilateral to lesion fails to move past midpostion during horizontal gaze.
  • Both VI nuclei are intact so lateral movements of both eyes

Neuroanatomy Exam 1 (14 decks)

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