Anatom3DIV — Trochlear nerve
Nervus trochlearis (IV) · IV — kladkový nerv
Nervous system
Looks like
The thinnest cranial nerve, leaving the back of the midbrain and running forward to a single eye muscle.
What it does
Moves the eye down and inwards, as when reading or walking downstairs.
Keeping it well
Easily injured by head trauma; vertical double vision worse looking down, with a head tilt, needs assessment.