CN II

Question 1

where is the oculomotor nucleus located

Answer 1

rostral midbrain

Question 2

where is the trochlear nucles located

Answer 2

caudal midbrain, right below the oculomotor nucleus

Question 3

where is the abducens nuleus located

Answer 3

caudal pons, next to facial nucleus

Question 4

what are the components of CN III

Answer 4

GSE, GVE

Question 5

what muscles does CN III innervate

Answer 5

levator palpebrae superioris, super rectus, medial rectus, inferior rectus, inferior oblique, sphincter pupillae, ciliary muscle

Question 6

function of shicter pupillae muscl

Answer 6

contrsict pupil

Question 7

function of ciliary muscle

Answer 7

accommodatino of lens for near vision

Question 8

what does CN III pass between

Answer 8

posterior cerebral a and superior cerebellar A

Question 9

how does CN III exist the cranium

Answer 9

superior orbital fissure

Question 10

what happens if there is damage to cavernous sinus

Answer 10

damager to CN III and other CNs

Question 11

what does pt with CN III lesion look like

Answer 11

ptosis of upper eyelid
wrinkled forward
raised eyebrow
dilated pupil
downward abducted eye

Question 12

what does horner’s syndrome look like

Answer 12

ptosis
contricted eye (miosis)
anhidrosis - lack of sweating

Question 13

lesion in the rigth optic nerve and light source applied to right eye what happens

Answer 13

neither pupil constricts

Question 14

lesion in right optic nerve and light source applied to left eye what happens

Answer 14

both pupil constrict

Question 15

lesion to right oculcomotor and apply light source to rigth eye what happens

Answer 15

only left pupil constrictsss

Question 16

lesion to right oculomotor and pply light source to left eye what happens

Answer 16

only left pupil constricts

Question 17

is sympathetic innercation of eye associated with oculomotor nerve

Answer 17

nope

Question 18

what causes weber syndrome

Answer 18

lesion in rostral midbrain

Question 19

what is the function component of CN IV

Answer 19

GSE

Question 20

what muscle does CN IV innervate

Answer 20

superior oblique

Question 21

why is CN IV unique

Answer 21

only CN that arises from contralateral nucleus
only CN that decussate inside brainstem
only CN that emerges from back of brainstem
thinnest CN

Question 22

what does CN IV pass between

Answer 22

posterior cerebral A and superior cerebella ra

Question 23

where does CN IV exit the cranium

Answer 23

superior orbital fissure

Question 24

what is primary action of superior oblique

Answer 24

intort eyeball

Question 25

what is the secondary action of superior oblique

Answer 25

doward gaze aided by superior oblique

Question 26

what is the tertiary action of superior oblique

Answer 26

lateral rotation

Question 27

what happens if SO is paralysex

Answer 27

eye deviated eupward, is extored

vertical diplopia

Question 28

what happens with superior oblique palsy

Answer 28

hypertropia

extorted

Question 29

what makes symptoms of trochlear nerve lesion worse

Answer 29

downward gaze
medial gase
tilted head to affected side

Question 30

what is the function component of CN VI

Answer 30

GSE

Question 31

what does CN VI innervate

Answer 31

lateral rectus

Question 32

what happens with lesion to CN VI

Answer 32

lateral rectus muscle paralyzed

pt not able to abduct eye

Question 33

abducens nucleus is teh center for what

Answer 33

conjugate horizontal eye movements

Question 34

what does lesion to right MLF cause

Answer 34

internuclear opthalmoplegia

Question 35

internuclear ophthalmoplgeia

Answer 35

adduction deficiet of one eye during conjugate horizontal eye movement when gazing away from side of lesion