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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
nerves in cavernous sinus
III, IV, VI, V1 (opthalmic), V2 maxillary) SNS fibers with ICA
26
cavernous sinus does what
drains blood from eyes and cortical veins-to empty into jugular vein
27
voluntary elevation of upper eyelid
CN III-LPS -bilaterally central caudal nucleus
28
sns fibers innvervate what MIDDLE MUSCLE OF THE THREE
tarsal muscle-autonomic elevation of eyelid, Sympathetic innveration of dilator pupil muscles
29
Parasympathetic | innveration of which muscles
pupillary constrcitor muscle OUTERMOST MUSCLE | ciliary muscle-ACCOMODATION-INNERMOST MUSCLE
30
cilliary (ACH -PANS) accomplishes what?
ACCOMODAITON IS A MOTHER FUCKING PANS FUNCTION--> produces changes in lenze shape as the eye is converged--
31
superior oblique (IV) causes
intorsion of the eye
32
inferior oblique (III) causes
extorsion of the eye
33
SO in lateral gaze
the adducted eye- SO aligned on axis-depression of adducted eye abducted eye-in perpendicular to axis-intorsion
34
axis of eye
center of lense to retinal fovea- most direct path of light entering the eye
35
sns in the eye ball muscles
superior tarsal, dilatory muscle of pupil
36
PANS msucles in the eye
cilliary-accomodation | sphincter of pupil-via the edinger westphal nucleus
37
LPS-
CNIII, volitional control of eye lid
38
CNIII palsy due to comrpession- which fibers affected first
the periheral EW nucleus fibers running in the CN III
39
NEURO emegency- first presenting sign with aneurysm onto CN III
unilateral pupillary enlargment - then unilateral paresis
40
less severe presentaiton of CN II palsy due to diabetes
unilateral peresis of III wihtout enlargement of the-OCCLUSIONOF THE CENTER BV THAT SUPPLY THE pupil
41
COMPRESS CN III FROMT HE OUTSIDE IN
NEURO EMERGENCY-ENLARGED PUPIL PLUS LATER PARESS
42
occlusion of mcirovasculature damage from wihtin to outside CN III
DM PALSY | PARESIS FIRST WIHTOUT DEVELOPMENT OF PUPILLARY ENLARGEMENT
43
describe the fibers in the CNIII and what they go to
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
lesion of right abducens
left gaze-normal | right gaze-right eye stays straight, left eye moves normally
45
right abducene nucleus
left gaze-normal | right gaze-neither eye mves bc 6 is lost and MLF to move left eye medial lost too
46
right PPRF lesion
same as right aducens nucleus lost left gaze fine right gaze neither eye moves
47
LEFT INO | left MLF only
left gaze is fine right gaze- right eye cant move left, nystagmus in the left eye for some reason
48
1 1/2 syndrome
left MLF and left abducencs
49
describe 1 and 1/2 syntome
left gaze eyes cant move | right gaze-. right eye has nystagmus, left eye doesnt move

Neuro (19 decks)

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