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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