Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
Common palsies of CN III
|
Exotropia (medial rectus failure)
Hypotropia (IO, SR failure) Ptosis (levator palpebrae failure) Mydriasis (parasym innervation loss) |
|
If CN III is damaged, exotropia results because . . .
|
. . . the lateral rectus is not opposed
|
|
Common palsies of CN IV
|
Hypertropia (unopposed IO) -- there will often be a cocommittant head tilt away from lesion)
|
|
Treatment for CN IV palsy?
|
Remove antagonist muscle (IO) or tighten the agonist (SO)
|
|
If the CN IV lesioned eye is abducting, will there be hypertropia?
|
No. SO only depresses on adduction.
|
|
Common palsy of CN VI
|
Esotropia (unopposed medial rectus)
|
|
Common cause of total eye movement loss, mydriasis, and ptosis?
|
Palsy of III, IV, VI -- carotid-cavernous fistula
|
|
Causes of non-paralytic strabismus "cross-eye"
|
Thyroid disease, orbital fractures, childhood (correctable), myasthenia gravis
|
|
In Graves' disease, what can happen to extraocular muscles?
|
Abnormal thickening -- therefore the eye bulges
|
|
Weird characteristic of childhood strabismus?
|
Eye-switching of abnormal adduction, abduction
|
|
5 eye structures innervated by ANS
|
Iris sphincter (parasym)
Iris dilator (sym) Ciliary body (parasym) Ciliary epi (sym) Superior tarsal muscle |
|
Contraction of the ciliary body causes?
|
accomodation
|
|
Purpose of the ciliary epi?
|
Manufacture aqueous humor
|
|
Innervation of superior tarsal muscle
|
Sympathetic (Horner's syndrome)
|
|
Two treatments for glaucoma
|
Increase aqueous outflow or decrease aqueous production
|