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Neuro > 14: CN 3, 4, 6 > Flashcards

14: CN 3, 4, 6 Flashcards

1
Q

cn 3

A

occulomotor

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2
Q

cn 4

A

trochlear

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3
Q

cn 6

A

abducens

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4
Q

brain stem nuclei that control reflex eye movements

A

Paramedian reticular formation

vestibular nuclei

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5
Q

eye movement nuclei in the midbrain just ventral to the superior and inferior colliculus respectively

A

III and IV

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6
Q

CN nucleus in the caudal 1/2 of the pons

A

abducent (VI)

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7
Q

how many muscles does CN III control

A

5-therefore 5 diff nuclei

-edinger westphal fibers run IN III but are considered separate nucleus

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8
Q

funciton so EW nucleus

A

PANS supply to the constrictor muscles of the iris as well as the accomodation reflex

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9
Q

name the 5 nuclei for the CN ii nucleus

A 
doral
intermediate
medial
ventral
central caudal
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10
Q

dorsal nucleus m

A

inferior rectus

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11
Q

intermediate nucleus

A

inferior oblique

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12
Q

medial nucleus

A

superior rectus

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13
Q

ventral nucleus

A

medial rectus

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14
Q

central caudal nucleus

A

levator palpebre superioris

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15
Q

motor muscles innervated by CN II

A

SR, MR, IR, IO, LPS

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16
Q

trochlear nerve m

A

superior obliqe

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17
Q

abducent

A

lateral recutr

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18
Q

facial colliculus

A

where CN VII sends its fibers over CN VI-creating a bump on the caudal pons dorsally

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19
Q

bilateral nuclei in CN III

*rest are ipsilateral except medial nucleus

A

central caudal

edinger westphal

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20
Q

contraltera nucleus

A

medial-contralat. superior rectus

21
Q

only CN that exits brainstem dorsally

A

CN IV-just caudl to the inferior colliculus

22
Q

CN iv

A

contralateral superior oblique

23
Q

two contralaterally controlled eye muscles

A

Superior oblique, superior rectus
trochlear-also only one that exits dorsally
medial nucleus of the occulomotor nucleus-

24
Q

trace the path of CN III

*highly subject to compression

A

passes between the posterior cerebral and superior cerebellar arteries, then along PCOM, and uncer ICA

25
Q

nerves in cavernous sinus

A

III, IV, VI, V1 (opthalmic), V2 maxillary) SNS fibers with ICA

26
Q

cavernous sinus does what

A

drains blood from eyes and cortical veins-to empty into jugular vein

27
Q

voluntary elevation of upper eyelid

A

CN III-LPS -bilaterally central caudal nucleus

28
Q

sns fibers innvervate what

MIDDLE MUSCLE OF THE THREE

A

tarsal muscle-autonomic elevation of eyelid, Sympathetic innveration of dilator pupil muscles

29
Q

Parasympathetic

innveration of which muscles

A

pupillary constrcitor muscle OUTERMOST MUSCLE

ciliary muscle-ACCOMODATION-INNERMOST MUSCLE

30
Q

cilliary (ACH -PANS) accomplishes what?

A

ACCOMODAITON IS A MOTHER FUCKING PANS FUNCTION–> produces changes in lenze shape as the eye is converged–

31
Q

superior oblique (IV) causes

A

intorsion of the eye

32
Q

inferior oblique (III) causes

A

extorsion of the eye

33
Q

SO in lateral gaze

A

the adducted eye- SO aligned on axis-depression of adducted eye
abducted eye-in perpendicular to axis-intorsion

34
Q

axis of eye

A

center of lense to retinal fovea- most direct path of light entering the eye

35
Q

sns in the eye ball muscles

A

superior tarsal, dilatory muscle of pupil

36
Q

PANS msucles in the eye

A

cilliary-accomodation

sphincter of pupil-via the edinger westphal nucleus

37
Q

LPS-

A

CNIII, volitional control of eye lid

38
Q

CNIII palsy due to comrpession- which fibers affected first

A

the periheral EW nucleus fibers running in the CN III

39
Q

NEURO emegency- first presenting sign with aneurysm onto CN III

A

unilateral pupillary enlargment - then unilateral paresis

40
Q

less severe presentaiton of CN II palsy due to diabetes

A

unilateral peresis of III wihtout enlargement of the-OCCLUSIONOF THE CENTER BV THAT SUPPLY THE pupil

41
Q

COMPRESS CN III FROMT HE OUTSIDE IN

A

NEURO EMERGENCY-ENLARGED PUPIL PLUS LATER PARESS

42
Q

occlusion of mcirovasculature damage from wihtin to outside CN III

A

DM PALSY

PARESIS FIRST WIHTOUT DEVELOPMENT OF PUPILLARY ENLARGEMENT

43
Q

describe the fibers in the CNIII and what they go to

A

muscles-movement in the middle-dies first with DM palsy-less severe-paresis but the EW fibers ok so no pupil enlargement
-PANS fibers are dorsal and peripherl-more suceptible to aneurysmal injury-loss of constricotr reflex and pupil enlargemtn

44
Q

lesion of right abducens

A

left gaze-normal

right gaze-right eye stays straight, left eye moves normally

45
Q

right abducene nucleus

A

left gaze-normal

right gaze-neither eye mves bc 6 is lost and MLF to move left eye medial lost too

46
Q

right PPRF lesion

A

same as right aducens nucleus lost
left gaze fine
right gaze neither eye moves

47
Q

LEFT INO

left MLF only

A

left gaze is fine
right gaze-
right eye cant move left, nystagmus in the left eye for some reason

48
Q

1 1/2 syndrome

A

left MLF and left abducencs

49
Q

describe 1 and 1/2 syntome

A

left gaze eyes cant move

right gaze-. right eye has nystagmus, left eye doesnt move

Neuro (19 decks)

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