What is the CN 4? What muscle does it innervate?
Trochlear Nerve, Innervates the Superior Oblique.
What is the primary function of the Superior Oblique?
It is a depressor, especially when the patient looks towards his nose.
What are the 4 questions to ask a patient who complains of diplopia?
1. Does the double vision disappear when you cover an eye?
2. Does the double vision appear side to side or up and down?
3. Is the double vision worse when you look to the right or to the left?
4. Is the double vision worse when you look up close or afar?