CN IV: Trochlear Nerve

Question 1

What type of axon?

Answer 1

General somatic efferent

Question 2

Is there a decussation in CN IV?

Answer 2

Yes but it is just before exiting brainstem. So lesion to nerve will result in ipsilateral deficit

Question 3

Results of IV injury?

Answer 3

Eye points up a bit, head tilts away from the lesion

Double vision

Question 4

Where does the trochlear nerve exit the brainstem?

Answer 4

Caudal midbrain