30 Gaze Palsies

Conjugate Gaze

• look to right: begin in PPRF signal to CN 6 nucleus, innervate LR

• MLF: CN 6 nerve fiber to contralateral CN III

• PPRF next to MLF and CN 6 nucleus

INO

• INO aka

• left INO: left MLF damaged, can't gaze right

• move left: everything ok

• move right: midline

• gaze right

• LR of right eye ok

• MLF damaged: left eye can't adduct

• left INO

• left INO: left eye can't gaze right

• right INO: right eye can't gaze left

CN 6 Palsy

PPRF

• no PPRF: can't initiate gaze to affected side

• both eyes can't gaze right, opposed to CN 6 (only right eye can't gaze right)

One and Half

Frontal Eye Field

• normal gaze: right and left FEF both pushing eyes equally

• lesion: remove activation of one side, other side dominates