week 3

Question 1

which develops first, acc and vergence or oculomotor?

Answer 1

acc and vergence are first

Question 2

Control centers of pursuits are at the:

supranuclear control is? ipsi or contra?

Answer 2

occipitoparietal junction
Occipitoparietal>midbrain>nuclei of EOMs
Supranuclear control of pursuits is ipsilateral

Question 3

Control centers of saccades are in the:

Answer 3

frontal eye fields
Frontal eye fields>midbrain pons>nuclei of EOMs
Supranuclear control of saccades is contralateral

Question 4

what is cogwheeling?

Answer 4

step like movements instead of pursuits

Question 5

what should be cause of cogwheeling?

Answer 5

• Basal ganlia disease
• Parkinson’s disease (rigidity, tremors, DA deficiency)
• Cerebellar disease

Question 6

what might cause truncated saccades?

Answer 6

myasthenia gravis

Question 7

what could cause too fast saccadic velocity?

Answer 7

Could be caused by INO (lesion in the MLF, affected eye cannot adduct, unaffected eye will abduct w/ nystagmus)

Question 8

give an example of inappropriate saccades

Answer 8

Saccadic intrusion syndrome (disrupts fixation)

Question 9

most common saccadic inaccuracy?

Answer 9

undershoots

*overshoots much less common