occulomotor system Flashcards
1
Q
what is rotary nystagmus?
A
slow movement of fixation and rapid movement of resetting
2
Q
is smooth pursuit under voluntary control?
A
not once fixation on the image has been established
3
Q
what must occur for convergence to happen without blurring?
A
activation of both medial rectus muscles, pupillary constriction, accomodation (rounding of the lens)
4
Q
would an impairment of the horizontal or vertical gaze centers have an effect on convergence or accomodation?
A
no
5
Q
where is the superior colliculus?
A
it is located in the midbrain
6
Q
what is exotropia?
A
a lesion of the oculomotor nerve (CNIII). Results in loss of all eye movement except that of lateral rectus (abduction) and superior oblique (depression), drooping of eye lids, dilation of pupils
