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Clinical Human Anatomy: Head and Neck > Cranial Nerves: Motor > Flashcards

Cranial Nerves: Motor Flashcards

1
Q

What is CN III?

A

Oculomotor

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2
Q

Where is the location of neuron cell bodies of CN III?

A

Upper Midbrain–oculomotor nucleus

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3
Q

What is the passage of CN III through the skull?

A

Superior Orbital Fissure –Sphenoid bone

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4
Q

Where does the oculomotor nerve emerge?

A

near median plane at junction of midbrain and pons–>cavernous sinus–> superior orbital fissure

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5
Q

Where does the rectus m. originate?

A

common tendinous ring—oculomotor nerve ends up here

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6
Q

Levator palpebrae innervated by:

A

Oculomotor III

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7
Q

Superior Rectus m. innervated by:

A

Oculomotor III

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8
Q

Inferior Rectus m innnervated by:

A

Oculomotor III

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9
Q

Medial Rectus m. innervated by:

A

Oculomotor III

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10
Q

Inferior Oblique m. innervated by:

A

Oculomotor III

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11
Q

Oculomotor nerve palsy

A

causes ptosis = eyelid droop due to paralysis of levator palpebrae muscle

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12
Q

Ptosis

A

paralysis of levator palpebrae~ eyelid droop

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13
Q

What is the resting position of the eye?

A

Down and out when oculomotor isn’t working—when superior oblique and lateral rectus m. aren’t working

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14
Q

CC: pupil is fixed and dialated

A

Oculomotor III is out

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15
Q

A cavernous sinus injury causes damage to what cranial nerve?

A

CN III

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16
Q

An aneurysm of posterior cerebral or superior cerebellar artery causes damage to which cranial nerve?

A

CN III

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17
Q

CN IV

A

Trochlear

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18
Q

Function of trochlear nerve?

A

somatic motor–eye movement

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19
Q

Location of neuron cell body of Trochlear nerve

A

Lower midbrain: trochlear nucleus

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20
Q

Where does trochlear nerve pass through skull

A

Superior Oribital fissure: sphenoid bone

21
Q

Where does the trochlear nerve emerge from midbrain?

A

from dorsal aspect of midbrain

22
Q

What is the only nerve to emerge dorsally from the skull?

A

Trochlear nerve

23
Q

What structure does the trochlear nerve innervate?

A

Superior oblique muscle

24
Q

What happens when the Trochlear nerve is injured?

A

Can’t look down when eye is adducted which is called diplopia

25
Q

What causes injury to trochlear nerve?

A

cavernous sinus injury

26
Q

What is CN VI

A

Abducent

27
Q

What is the fnx f CN VI?

A

somatic eye movement

28
Q

Location of NCB of Abducent?

A

Pons–abducent nucleus

29
Q

How does the Abducent nerve exit the skull?

A

sphenoid bone–superior orbital fissure

30
Q

What is the route of the Abducent nerve?

A

emerges near medial plane at jnx of pons and medulla–> through the cavernous sinus and superior orbital fissure–> through common tendinous ring

31
Q

What structure does the Abducent nerve innervate?

A

Lateral rectus muscles

32
Q

What causes horizontal diplopia (double vision)

A

Abducent nerve (VI)

33
Q

What causes impaired eye abduction?

A

Abducent nerve damage VI

34
Q

Which way does the eye turn when the Abducent nerve is damaged?

A

Eye turns medially~ medial rectus muscle out)

35
Q

What causes injury to Abducent nerve VI?

A

Cavernous sinus injury and fracture to base of skull

36
Q

What nerve is CN XI?

A

Accessory nerve

37
Q

Where is the location of neuronal cell bodies of CN XI?

A

Spinal Cord: anterior horn of cervicle region

38
Q

Where does the Accessory nerve pass through the skull?

A

Rootlets (intermediate in position of exit from sp cd) via foramen magnum
–exits via jugular foramen

39
Q

What structures are innervated by the Accessory nerve?

A

SCM and and Trapezius

40
Q

What kind of injury would cause damage to accessory XI

A

neck laceration

41
Q

Special part of CN XI

A

spinal root represents CN XI in it’s entirety, cranial roots emerge from medulla but those are part of CN X

42
Q

What nerve is CN XII?

A

Hypoglossal nerve

43
Q

The location of the NCB of CN XII?

A

Medulla–hypoglossal nucleus

44
Q

Where does the CN XII pass through the skull?

A

Occipital bone–hypoglossal canal

45
Q

What is the route of CN XII?

A

Emerges from sides of medulla anterior to olives–> passes through hypoglossal canal–> curves forward near angle of mandible superior to ansa cervicalis to enter tongue

46
Q

What structures does hypoglossal XII innervate?

A

All intrinsic tongue muscles

All extrinsic tongue muslces except Palatoglossus (CN X)

47
Q

What happens to tongue when there is a peripheral lesion in Hypoglossal CN XII?

A

tongue deviates towards side of injury

–lick your wounds

48
Q

What would cause an injury to hypoglossal CN XII

A

Neck laceration

Clinical Human Anatomy: Head and Neck (12 decks)

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