When the fourth cranial nerve is injured or diseased, it can cause paralysis of the superior oblique muscle. This is known as superior oblique palsy, trochlear nerve palsy, or fourth nerve palsy.

There are many things that can lead to CN IV palsy. Most commonly, accounting for 40 to 70 percent of cases, this is a congenital issue meaning the patient is born with it and there is data that ...

The trochlear nerve, also known as cranial nerve 4 (CN IV), controls the superior oblique muscle in your eye. This muscle allows you to move your eyeball down and shift your gaze from side to side.

Traumatic trochlear nerve palsy would result in reduced ability of the affected eye to look down and inward, and although inferior oblique overaction is often present, this elevation of the eye ...