Occulomotor B6

Question 1

Left CN IV nucleus innervates what?

Answer 1

Right superior oblique, they cross in midbrain (only example he could think of that is contralateral)

Question 2

If you lesion occulomotor nerve on one side.

Answer 2

DOWN AND OUT. IT will depress and abduct. (Muscles still working are unopposed by occulomotor)

Question 3

If you lose CN3 what is left?

Answer 3

Superior oblique (down and out)
Lateral rectus (pulling out)
Diplopia and drooping of eyelid
Pupilary dilation and loss of direct constriction response (loss of Parasympathetics)

Question 4

Look at the 6 lesions and where they synapse, where they cross and the positions of gaze for each.

Answer 4

do it