A complex system of nerves and muscles enables the human eye to blink, gaze, and shift focus. The trochlear nerve is one of six cranial nerves that carry electrical impulses from the brain to the eye.

Your brainstem hosts multiple cranial nerves. The facial nerve is the seventh cranial nerve. It controls your facial movements and expressions. The nerve fibers controlled by your facial nerve also ...

Cranial neuropathy occurs when there is damage to the cranial nerves in the brain or brain stem. Depending on the affected cranial nerve, people may experience different symptoms, such as weakness on ...

The trochlear nerve is also known as cranial nerve IV (CN-IV). It is the only cranial nerve that emerges dorsally from the brain (near the back), giving it the longest pathway. It is the smallest ...