Brainstem Motility Disorders Flashcards
When the macula is too high, the eye is ____.
Intorted (higher eye intorts)
When the macula is too low, the eye is _____.
Extorted (lower eye extorts)
Superior muscles _____. Inferior muscles _____.
- Superior = intort
- Inferior = extort
The MVN and LVN tell the eye to move _____. What 2 muscles are yoked for this motion?
- tells eye to move down
- IR and SO
The Superior VN tell the eye to move ____. What 2 muscles are yoked for this motion?
- tells eye to move up
- SR and IO
What usually has a higher deviation magnitude? Skew or CN IV palsy?
Skew
If a skew deviation is worse in downgaze, which VN are lesioned?
MVN and LVN = can’t tell eye to go down
If a skew deviation is worse in upgaze, which VN is lesions?
SVN = can’t tell eye to go up
The higher, intorted eye is ______ to the lesion below the graviceptive pathway crossing?
opposite
The higher, intorted eye is _____ to a lesion above the graviceptive pathway crossing?
ipsilateral
Disconjugate torsion implies a _____ level lesion and conjugate torsion implies ____ level lesion.
- disconjugate = lower
- conjugate = higher
Where are the 4 main areas to localize lesions with a skew deviation?
- Vestibular Nerve
- Medulla
- Midbrain
- MLF/Pons
What is a very common finding with a skew deviation?
INO
An INO is defined by the eye that does not ____.
adduct
For a BNO, if the patient cannot converge where does the lesion localize to?
Midbrain
