Master CN IV with Picmonic for Medicine

With Picmonic, facts become pictures. We've taken what the science shows - image mnemonics work - but we've boosted the effectiveness by building and associating memorable characters, interesting audio stories, and built-in quizzing.

CN IV

Brainstem with 4x4s
Picmonic
Also known as the trochlear nerve. It is a motor nerve that controls the superior oblique extraocular muscle.
3 KEY FACTS
Trochlear Nerve
Truck Pulling Eyes

The nucleus of the trochlear nerve exists in the caudal midbrain. This cranial nerve is unique from all others because it’s fibers cross the midline prior to exiting the brainstem and they exit from the dorsal surface of the brainstem.

Motor
Motor

The trochelar nerve is a somatic motor neuron.

Abducts, Depresses, Internally Rotates
Trucks Abducting, Depressing and Internally Rotating Eyes

CN IV controls the superior oblique muscle which abducts, depresses and internally rotates the eye. If damaged the eye drifts upward leading to vertical diplopia. This manifests when reading the newspaper or walking down stairs.

Unlock all 3 facts & definitions with Picmonic Free!

JOIN FREE

Take the CN IV Quiz

Picmonic's rapid review multiple-choice quiz allows you to assess your knowledge.

START QUIZ NOW

It's worth every penny

Our Story Mnemonics Increase Mastery and Retention

Memorize facts with phonetic mnemonics

Unforgettable characters with concise but impactful videos (2-4 min each)

Ace Your Medical (MD/DO) Classes & Exams with Picmonic:

Over 870,000 students use Picmonic’s picture mnemonics to improve knowledge, retention, and exam performance.

Choose the #1 Medical (MD/DO) student study app.

Picmonic for Medicine (MD/DO) covers information that is relevant to your entire Medical (MD/DO) education. Whether you’re studying for your classes or getting ready to conquer the USMLE Step 1, USMLE Step 2 CK, COMLEX Level 1, or COMLEX Level 2, we’re here to help.

Works better than traditional Medical (MD/DO) flashcards.

Research shows that students who use Picmonic see a 331% improvement in memory retention and a 50% improvement in test scores.