CN II Flashcards
(35 cards)
where is the oculomotor nucleus located
rostral midbrain
where is the trochlear nucles located
caudal midbrain, right below the oculomotor nucleus
where is the abducens nuleus located
caudal pons, next to facial nucleus
what are the components of CN III
GSE, GVE
what muscles does CN III innervate
levator palpebrae superioris, super rectus, medial rectus, inferior rectus, inferior oblique, sphincter pupillae, ciliary muscle
function of shicter pupillae muscl
contrsict pupil
function of ciliary muscle
accommodatino of lens for near vision
what does CN III pass between
posterior cerebral a and superior cerebellar A
how does CN III exist the cranium
superior orbital fissure
what happens if there is damage to cavernous sinus
damager to CN III and other CNs
what does pt with CN III lesion look like
ptosis of upper eyelid wrinkled forward raised eyebrow dilated pupil downward abducted eye
what does horner’s syndrome look like
ptosis
contricted eye (miosis)
anhidrosis - lack of sweating
lesion in the rigth optic nerve and light source applied to right eye what happens
neither pupil constricts
lesion in right optic nerve and light source applied to left eye what happens
both pupil constrict
lesion to right oculcomotor and apply light source to rigth eye what happens
only left pupil constrictsss
lesion to right oculomotor and pply light source to left eye what happens
only left pupil constricts
is sympathetic innercation of eye associated with oculomotor nerve
nope
what causes weber syndrome
lesion in rostral midbrain
what is the function component of CN IV
GSE
what muscle does CN IV innervate
superior oblique
why is CN IV unique
only CN that arises from contralateral nucleus
only CN that decussate inside brainstem
only CN that emerges from back of brainstem
thinnest CN
what does CN IV pass between
posterior cerebral A and superior cerebella ra
where does CN IV exit the cranium
superior orbital fissure
what is primary action of superior oblique
intort eyeball
