Lect 9 CN palsies 2 Flashcards
(T/F) The abducens nerve (CN 6) enters the orbit via SOF through the annulus of Zinn
true
Which one of the following is NOT true?
a) the cerebellopontine angle/pontomedullary jxn affects CN 6, 7, and 8
b) clivus lesions affect CN 6 due to mechanical compression of raised ICP
c) The most common cause of acquired CN 6 palsy in children and adults is trauma
d) The most common cause of acquired CN 6 palsy in older adults is neoplasm
d) The most common cause of acquired CN 6 palsy in older adults is neoplasm (FALSE, in older adults it is ischemia)
(T/F) Duane’s retraction syndrome is a congenital disorder that causes agenesis of CN 6 nucleus and nerve
true
Which 3 are correct regarding Duane’s syndrome?
a) ADuction is impaired in type 1
b) ABduction is impaired in type 1
c) ADduction is impaired in type 2
d) ABduction is impaired in type 2
e) ADduction and ABduction are both impaired in type 3
b) ABduction is impaired in type 1 (ADduction normal)
c) ADduction is impaired in type 2 (ABduction normal)
e) ADduction and ABduction are both impaired in type 3
A superior oblique tendon sheath syndrome is also called:
a) Grey’s syndrome
b) Brown syndrome
c) Duane’s syndrome
d) Gary’s syndrome
b) Brown syndrome. Signs: restriction of elevation in ADduction and normal elevation in ABduction
Which one of the following is NOT true in regards to ischemic CN III palsy?
a) it is accompanied by pain, weakness, and numbness
b) occurs in pts 40+ years of age
c) spontaneous recovery by 3 months
d) at least one vasculopathic risk factr (such as DM, HTN, smoking)
a) it is accompanied by pain, weakness, and numbness (FALSE, there are no additional symptoms)
Which one of the following is NOT true in regards to congenital CN 4 palsy?
a) evidence of longstanding head tilt form old photos
b) any age group
c) vertical functional amplitude of more than 8 D
d) less than 10 degrees torsion on double maddox rod test
e) history of hyperlipidemia
e) history of hyperlipidemia (FALSE, medical history is unremarkable)
